ChangeLog

	* fs/vfs:  file_seek() is an internal OS interface and should not errors
	  via the errno (2017-09-28).
	* fs/vfs:  file_read() is an internal OS interface and should not errors
	  via the errno (2017-09-28).
	* fs/vfs:  file_write() and file_pwrite() are internal OS interfaces and
	  should not report errors via the errno (2017-09-28).
	* STM32L4 FLASH, DFSDM: option bytes, JEXTSEL bits, ADC1 output to DFSDM
	  chips change
	    - STM32L4 FLASH: add function for modifying device option bytes
	    - STM32L4 DFSDM: add JEXTSEL bits, ADC1 output to DFSDM chips change
	  ST's documentation hints that ADC output can be routed to DFSDM on
	  some STM32L4X3 chips, but I got confirmation from tech support that
	  this is just a documentation error so remove this from Kconfig
	  From Juha Niskanen (2017-09-29).
	* This commit adds support for routing tables in files in a file
	  system.  This might be useful for customized, per-unit routing tables.
	  There are two issues with it however:
	    1. Reading from file system on a per packet basis could be slow.  I
	      think it probably should have a small, in-memory cache of most
	      frequently used routes for good problem.
	    2. Currently the delroute logic is disabled due to a problem with
	      the design.  NuttX does not currently support truncate().
	      Therefore, it is not possible to delete entries from the routing
	      table file.
	  In this current implementation, that leaves the last entry intact at
	  the end of the file.  An alternative design might include a tag on
	  each record to indicate if the record is valid or not.  That would
	  work but would add complexity to the other routing table functions
	  (2017-09-29).
	* net/route:  Add support for an in-memory routing table cache in order
	  to improve performance when the routing table is retained in a file.
	  The cache holds the most recently used routing table entries and so can
	  eliminate some file access.  Flush the in-memory cache when any entry is
	  deleted from the routing table.  When a router matching an IP address is
	  found, add the routing table entry to the cache (2017-09-29).
	* fs/vfs:  null check for path on open and buf on write.  Null path
	  check is depend on CONFIG_DEBUG_FEATURES and CONFIG_DEBUG_ASSERTIONS,
	  added null checking so it's always performed Added null checking on buf
	  for write().  From Xiao Qin (2017-09-29).
	* net/route:  File read/write logic should be able to handle short reads
	  and writes (2017-09-29).
	* drivers/syslog:  syslog internal functions should not set the errno
	  variable:  ramlog_putc(), syslog_dev_putc(), syslog_dev_write(),
	  syslog_force() (2017-09-29).
	* net/sockets:  psock_sendto() is an internal OS interface an should not
	  set the errno variable (2017-09-29).
	* net/sockets:  psock_send() is an internal OS interface an should not
	  set the errno variable (2017-09-29).
	* psock_send() no longer sets errno, so send() must now set it
	  (2017-09-30).
	* net/: Versions of psock_send() and pock_sendto() should not set
	  errno.  That is taken care of at a higher level in the send()/sendto()
	  implementation as appropriate (2017-09-30).
	* net/: psock_accept() is an internal interface and should not set the
	  errno (2017-09-30).
	* net/: psock_bind() is an internal interface and should not set the
	  errno (2017-09-30).
	* net/: psock_connect() is an internal interface and should not set the
	  errno nor should it be a cancellation point (2017-09-30).
	* net/: psock_listen() is an internal interface and should not set the
	  errno (2017-09-30).
	* net/: psock_getsockopt() is an internal interface and should not set
	  the errno (2017-09-30).
	* net/: psock_getsockopt() and psock_socket() are an internal interfaces
	  and should not set the errno (2017-09-30).
	* net/: psock_accept() is not a cancellation point (2017-09-30).
	* net/: psock_recvfrom() is an internal interface and should not set the
	  errno nor should it be a cancellation point (2017-09-30).
	* net/ and fs/: net_vfcntl(), file_fcntl(), file_dup(), and file_dup2()
	  are all internal OS interfaces and should not modify the errno value
	  (2017-09-30).
	* net_dupsd() and net_dupsd2() are internal OS functions and should not
	  set the errno variable (2017-09-30).
	* psock_ioctl() and netdev_ioctl() are internal OS functions and should
	  not set the errno variable (2017-09-30).
	* psock_close() and net_close() are internal OS functions and should not
	  set the errno variable (2017-09-30).
	* SAMv7, STM32, STM32 L4:  DAC and ADC drivers are not permitted to set
	  the errno (2017-09-30).
	* SIM LPC31xx:  Serial and console drivers are not permitted to set the
	  errno (2017-09-30).
	* STM32, STM32 F7:  LTDC and DMA2D drivers are not permitted to set the
	  errno (2017-09-30).
	* drivers/serial: 16550 UART driver IOCTL method must not set errno; it
	  must return a negated errno value (2017-09-30).
	* drivers/lcd: ILI9341 initialize method not permitted to set errno
	  (2017-09-30).
	* drivers/sensors:  LIS331DL driver not permitted to set errno
	  (2017-09-30).
	* drivers/wireless:  CC1101 driver not permitted to set errno
	  (2017-09-30).
	* configs/z80sim and xtrs:  Serial driver lower halfs ioctl methods
	  should return a negated errno value, not set the errno variable
	  (2017-10-30).
	* compiler.h, limits.h, types.h:  Update SDCC/z80 files to include
	  support for long long, inline, __FILE__, and __func__ (2017-10-01).
	* z80 Make.defs:  Fixes dependency generation with newest SDCC compiler
	  (2017-10-01).
	* include/:  Add stdnoreturn.h (2017-10-01).
	* tools/configure.sh: Add special support so that you can start with a
	  windows native configuration and install on a different host (and vice
	  versa). (2017-10-01).
	* stm32_hrtim: add support for capture, chopper, deadtime and dump
	  registers.  From Mateusz Szafoni (2017-10-01).
	* tools/configure.c:  Duplicate new functionaity added to configure.sh
	  (2017-10-01).
	* tools/configure.sh:  Another fix for the script.  The last change only
	  worked for Windows Cygwin; for Linux, it needed to remove some
	  additional things from the defconfig file (2017-10-01).
	* configs/z80sim: convert other configurations to default to Linux
	  (2017-10-01).
	* tools/:  configure.sh and configure.c should redirect stdout to
	  /dev/null but should not suppress stderr output (2017-10-01).
	* stdnoreturn.h:  Add definitions for the C11 noreturn keyword.  Also
	  Remove C++11 dependency.  Applies to C too (2017-10-02).
	* net/route:  Add logic to mark a route as most-recently-used in the
	  route cache (2017-10-02).
	* commit b2ea300b6fb7672cdb682a0957b5dd2cff63804d broke the STM32L4 port
	  for people not using the L496xx or L4A6xx.  That was because
	  stm32l4_sdmmc.h is included from the stm32l4.h global header, and this
	  header fires an #error for other chips.  I see that ALL stm32l4 have the
	  same SDMMC except the stm32l4x2, which has none.  From Sebastien Lorquet
	  (2017-10-02).
	* net/route:  Fix an error in cache list management (2017-10-02).
	* Add support for Micron MT25Q series MT25Q128.  From Sebastien Lorquet
	  (2017-10-02).
	* binfmt/:  Don't schedule starthook if there are no constructors
	  (2017-10-02).
	* binfmt/: exec_module(), load_module(), unload_module(), and
	  schedule_unload() are internal OS functions and must not alter the errno
	  variable (2017-10-02).
	* stm32f103-minimum: Add ADC support on stm32f103-minimum board.  From
	  Alan Carvalho de Assis (2017-10-02).
	* syscall/:  The non-standard interface exec() is now enshrined as a
	  official NuttX API.  I really dislike doing this but I think that this
	  is probably the only want to load programs in the protected mode.  It is
	  currently used by some example code under apps/ that generate their own
	  symbol tables for linking.  Other file execution APIs relay on a symbol
	  table provided by the OS.  In the protected mode, the OS cannot provide
	  any meaning symbol table for execution of code in the user-space blob so
	  that is they exec() is really needed in that build case.  And, finally,
	  the interface is completely useless and will not be supported in the
	  KERNEL build mode where the contrary is true:  An application process
	  cannot provide any meaning symbolic information for use in linking a
	  different process (2017-10-03).
	* STM32L4 RTC, PM: small fixes to subseconds handling, ADC
	  power-management hooks
	    - STM32L4 ADC: add PM hooks from Motorola MDK
	    - STM32L4 RTC: add up_rtc_getdatetime_with_subseconds
	    - STM32 RTC: workaround for potential subseconds race condition.  In
	      all recent STM32 chips reading either RTC_SSR or RTC_TR is supposed
	      to lock the values in the higher-order calendar shadow registers
	      until RTC_DR is read. However many old chips have in their errata
	      this silicon bug (at least F401xB/C, F42xx, F43xx, L15xxE, L15xVD
	      and likely others):  "When reading the calendar registers with
	      BYPSHAD=0, the RTC_TR and RTC_DR registers may not be locked after
	      reading the RTC_SSR register. This happens if the read operation is
	      initiated one APB clock period before the shadow registers are
	      updated. This can result in a non-consistency of the three
	      registers. Similarly, RTC_DR register can be updated after reading
	      the RTC_TR register instead of being locked."
	    - STM32L4 RTC: correct RTC_SSR and RTC_TR read ordering.  In all
	      recent STM32 chips reading either RTC_SSR or RTC_TR is supposed to
	      lock the values in the higher-order calendar shadow registers until
	      RTC_DR is read. Change the register read ordering to match this and
	      don't keep a workaround for a hypothetical race condition (not in
	      any L4 errata, lets for once assume ST's silicon works as it is
	      documented...)
	    - STM32L4 PM: remove useless #ifdefs and old non-L4 STM32 code
	  From Juha Niskanen (2017-10-03).
	* sched/semaphore:  Rename sem_reset() to nxsem_reset() so that it is
	  clear this is an internal OS function (2017-10-03).
	* sched/semaphore:  Rename sem_tickwait() to nxsem_tickwait() so that it
	  is clear this is an internal OS function (2017-10-03).
	* libc/semaphore:  Add nxsem_init() which is identical to sem_init()
	  except that it never modifies the errno variable.  Changed all
	  references to sem_init in the OS to nxsem_init() (2017-10-03).
	* sched/semaphore:  Rename all internal private functions from sem_xyz
	  to nxsem_xyz.  The sem_ prefix is (will be) reserved only for the
	  application semaphore interfaces (2017-10-03).
	* libc/semaphore:  Add nxsem_getvalue() which is identical to
	  sem_getvalue() except that it never modifies the errno variable.
	  Changed all references to sem_getvalue in the OS to nxsem_getvalue()
	  (2017-10-03).
	* libc/semaphore and sched/semaphore:  Add nxsem_getprotocol() and
	  nxsem_setprotocola which are identical to sem_getprotocol() and
	  set_setprotocol() except that they never modifies the errno variable.
	  Changed all references to sem_setprotocol in the OS to
	  nxsem_setprotocol().  sem_getprotocol() was not used in the OS
	  (2017-10-03).
	* sched/semaphore:  Add nxsem_destroy() which is identical to
	  sem_destroy() except that it never modifies the errno variable.  Changed
	  all references to sem_destroy() in the OS to nxsem_destroy() (2017-10-03).
	* sched/semaphore:  Add nxsem_post() which is identical to sem_post()
	  except that it never modifies the errno variable.  Changed all
	  references to sem_post in the OS to nxsem_post() (2017-10-03).
	* sched/semaphore:  Add the function nxsem_wait().  This is a new
	  internal OS interface.  It is functionally equivalent to sem_wait()
	  except that (1) it is not a cancellation point, and (2) it does not set
	  the per-thread errno value on return.  In all OS functions (not
	  libraries), change sem_wait() to nxsem_wait().  This will prevent the OS
	  from creating bogus cancellation points and from modifying the per-task
	  errno variable.  This commit also backs out most of commit
	  b4747286b19d3b15193b2a5e8a0fe48fa0a8638c.  That change was added because
	  sem_wait() would sometimes cause cancellation points inappropriately.
	  But with these recent changes, nxsem_wait() is used instead and it is
	  not a cancellation point (2017-10-04).
	* sched/semaphore:  sem_timedwait() is a cancellation point and, hence,
	  cannot be called from within the OS.  Created nxsem_timedwait() that is
	  equivalent but does not modify the errno and does not cause
	  cancellation.  All calls to sem_timedwait() change to calls to
	  nxsem_timedwait() in the OS (2017-10-05).
	* sched/semaphore:  sem_trywait() modifies the errno value and, hence,
	  should not be used within the OS.  Use nxsem_trywait() instead
	  (2017-10-05).
	* This change renames all internal, private NuttX signal-related
	  functions to use the prefix nxsig_ so that they cannot be confused with
	  application interfaces that begin, primarily, with sig_.  This is
	  analogous to similar renaming that was done previously for semaphores
	  (2017-10-05).
	* drivers/input/cypress_mbr3108:  Add missing variable for nxsem_wait
	  return value.  From Jussi Kivilinna (2017-10-06).
	* fs/vfs and net/socket:  fcntl() is not return success fail for
	  F_SETFL.  Reported by Jussi Kivilinna (2017-10-06).
	* This commit adds internal versions of the signal interfaces:
	    - sigtimedwait() -> nxsig_timedwait()
	    - sigwaitinfo()  -> nxsig_waitinfo()
	    - nanosleep()    -> nxsig_nanosleep()
	  Replace all usage of sigwaitinfo(), sigtimedwait(), and nanosleep()
	  with the OS internal counterparts nxsig_waitinfo(), nxsig_timedwait(),
	  and nxsig_nanosleep().  The internal OS versions differ from the
	  standard application interfaces in that they do not create
	  cancellation points and they do not modify the application's errno
	  variable (2017-10-06).
	* Adds new OS internal functions nxsig_sleep() and nxsig_usleep.  These
	  differ from the standard sleep() and usleep() in that (1) they don't
	  cause cancellation points, and (2) don't set the errno variable (if
	  applicable).  All calls to sleep() and usleep() changed to calls to
	  nxsig_sleep() and nxsig_usleep() (2017-10-06).
	* drivers/serial/tcdrain:  tcdrain() was recently added to the NuttX C
	  library.  But there is a problem.  The specification of tcdrain()
	  requires that it be a cancellation point.  In order to do this, tcdrain
	  was moved from the C library into the OS and the addition cancellation
	  point hooks were added.  In non-FLAT builds, access via system calls is
	  also now supported (2017-10-06).
	* net/Kconfig: Remove improper use of comma in syntax (2017-10-06).
	* mm/: Heap semaphore logic needs to use nxsem_* interfaces when
	  available, but the standard semaphores only when implementing a
	  user-space heap.  Not this does introduce and issue:  the memory
	  management functions them become cancellation points because of the use
	  of sem_wait (2017-10-07).
	* syscall/: Fix some backward conditional compilation (2017-10-07).
	* sched/signal:  Add nxsig_kill() which is functionally equivalent to
	  kill() except that it does not modify the errno variable.  Replace all
	  usage kill() in the OS proper with nxsig_kill() (2017-10-07).
	* graphics/vnc/server:  Fix an error in the VNC server introduced with
	  recent big set of changes (2017-10-07).
	* sched/signal:  Add nxsig_queue() which is functionally equivalent to
	  sigqueue() except that it does not modify the errno variable.  Replace
	  all calls to sigqueue() in the OS proper with calls to nxsig_queue() to
	  avoid accessing the errno variable (2017-10-07).
	* sched/signal:  Add internal OS interface nxsig_procmask().  This
	  internal interface is equivalent to the standard sigprocmask() used by
	  applications except that it does not modify the errno value.  Also fixes
	  a problem in that the original sigprocmask() was not setting the errno.
	  Replace all calls to sigprocmask() in the OS proper with calls to
	  nxsig_procmask(). (2017-10-07).
	* sama5d4-ek:  Remove a really old defconfig example file that is so far
	  out of date that it can only be misleading (2017-10-07).
	* Fix some build problems after recent separation of internal OS from
	  application interfaces.  The build problem only occurs in the PROTECTED
	  and KERNEL builds where separate libraries are built for the
	  applications and for use within the OS. In these cases, the correct
	  interfaces must be used.  This commit fixes a few of these, so I can get
	  through build testing, but there are many more that need fixin'
	  (2017-10-08).
	* SDCC Fixes:  Change some prototypes and some assumptions about the
	  size of unsigned int to get to a clean SDCC compile (2017-10-08).
	* Fix some problems in the previous commits:  Forgot to update sigset()
	  after change to prototype.  Also there was a stray semicolon in the
	  change signal() (2017-10-08).
	* libc/stdio:  Build the lib_noflush() and lib_snoflush() stubs even if
	  CONFIG_FILE_DESCRIPTORS=0.  They may still be needed (2017-10-08).
	* configs/z80sim: Fix a naming problem.  Also, don't try to build the
	  serial driver if CONFIG_NFILE_DESCRIPTOR=0 (2017-10-08).
	*  libc and libnx:  When the libraries are built into two libraries, a
	  user space library and a OS space library (as in the PROTECTED and
	  KERNEL build).  Then the user space library must not use the OS internal
	  interfaces; similarly, the OS must avoid using the userspace interfaces
	  so that it does not muck the errno value or create spurious cancellation
	  points (2017-10-08).
	* Misc STM32 Fixes
	    - stm32_hrtim.c: fix burst mode prescaler update
	    - stm32f334-disco: add flash mode support for powerled driver +
	      cosmetics
	  From Mateusz Szafoni (2017-10-08).
	* powerled.h:  Add fault field to state structure.  From Mateusz Szafoni
	  (2017-10-08).
	* libc/termios:  Adds tcflow() (2017-10-09).
	* RNDIS: Use CONFIG_USBDEV_MAXPOWER instead of hardcoded value.  Use
	  LPWORK for network operations by default.  From Sakari Kapanen
	  (2017-10-09).
	* sched/mqueue:  Rename all OS internal functions declared in
	  sched/mqueue/mqueue.h to begin with nxmq_ vs. mq_.  The mq_ prefix is
	  reserved for standard application interfaces.  Rename all private static
	  functions for use the nxmq_ vs. mq_ naming (2017-10-09).
	* task:  Add new cancellation point interface,
	  check_cancellation_point() (2017-10-09).
	* STM32, STM32L4 serial changes:
	    - stm32: serial: add interface to get uart_dev_t by USART number,
	      stm32_serial_get_uart
	    - stm32: serial: do not stop processing input in SW flow-control mode
	    - stm32l4: serial: do not stop processing input in SW flow-control
	      mode
	    - stm32l4: serial: suspend serial for Stop mode
	  From Juha Niskanen (2017-10-09).
	* Misc STM32 Fixes
	    - stm32_powerled.c: cosmetics
	    - stm32_hrtim.c: cosmetics
	    - stm32/Kconfig: add HRTIM configuration and add DAC external
	      trigger configuration
	    - stm32f334-disco: Add powerled example configuration.  From Mateusz
	      Szafoni (2017-10-09).
	* drivers/power: Add powerled to Kconfig.  From Mateusz Szafoni
	  (2017-10-09).
	* BCM2708:  Add enough infrastructrue (more stubs) to get a clean
	  compilation of the Pi Zero configuration (with many undefined things at
	  link time).   This includes several register definition header files
	  (some from Alan Carvalho de Assis), basic interrupt handling logic,
	  boot-up files, GPIO support, build and configuration logic, basic board
	  support at configs/pizero (2017-10-09).
	* sched/mqueue:  Add internal function nxmq_send() and nxmq_timedsend()
	  that are equivalent to mq_send() and mq_timedsend() except that they do
	  not create cancellation points and do to not modify the errno variable.
	  Change all calls to mq_send() and mq_timedsend() in the OS to calls to
	  nxmq_send() and nxmq_timedsend(), making appropriate changes for
	  differences in return values (2017-10-10).
	* sched/mqueue:  Add nxmq_receive() and mxmq_timedreceive() which are
	  functionally equivalent to the standard mq_receive and mq_timedreceive()
	  except that (1) they do not create cancellation points, and (2) the do
	  not modify the application's errno variable.  Change all calls to
	  mq_receive() and mq_timedreceive() in the OS to calls to nxmq_receive()
	  and nxmq_timedreceive(), making appropriate changes for differences in
	  return values (2017-10-10).
	* Fix a few places where there was a semicolon following the 'if'
	  condition, making the following logic unconditional (2017-10-10).
	* The INA219 is a combined voltage and current sensor that can measure
	  up to 26 volts and a current that depends on an external shunt
	  resistor.  Connection happens via i2c/smbus and the chip features a
	  power supply rail that is independent from the measured voltage, so it
	  can measure low voltages.

	  This commit adds a driver for this chip.  Right now it measures bus
	  voltage and current, and does not use the internal calibrated current
	  reading, nor the available power measurement.  From Sebastien Lorquet
	  (2017-10-10).
	* configs/clicker2-stm32: Adds SD card, automount, and syslog file
	  support and fixes a few minor issues
	    - Moves defines for xbee from clicker2-stm32.h to stm32_xbee.h
	    - Adds support for uSD click boards and automount support
	    - Fixes minor guard clause
	    - Bring-up automounter before MMCSD
	    - MRF24J40 interrupt should only fire on falling edge.
	    - Adds file syslog support for logging to file on SD card
	  From Anthony Merlino (2017-10-11).
	* Z80:  Makefile fix for use with current SDCC (2017-10-11).
	* fs/vfs:  Change the return value of internal function fs_getfilep().
	  It no longer sets the errno variable but, rather, returns errors in the
	  same manner as other internal OS functions (2017-10-11).
	* Adds OS internal functions nx_send(), ns_recv(), and nx_recvfrom()
	  which are functionally equivalent to send(), recv(), and recvfrom()
	  except that they do not set the errno variable and do not cause
	  cancellation points (2017-10-11).
	* Adds OS internal function nx_write() which is functionally equivalent
	  to write() except that it does not set the errno variable and do not
	  cause cancellation points (2017-10-11).
	* sched/task:  task_exithook.c fails to link if signals are disabled
	  because was unconditionally trying to send the SIGCHLD signal to the
	  parent in certain configurations.  Noted by Jeongchan Kim (2017-10-11).
	* arch/arm/src/samv7:  Correct an error in RX DMA setup.  From Manish
	  Kumar Sharma (2017-10-11).
	* net/socket: psock_send/psock_sendto: remove assert check for null
	  psock and buf input pointers.  Removes check as 'psock == NULL'
	  altogether because that checked for later in psock_send and
	  psock_sendto. Change null check for 'buf' so that it is handled same as
	  in recvfrom.c (return -EINVAL instead of assert).  From Jussi Kivilinna
	  (2017-10-11).
	* fs/vfs:  Add new internal OS interface nx_read().  nx_read() is
	  functionally equivalent to read() except that it does not modify the
	  errno variable and it is not a cancellation point.  Changed all
	  references to read() in the OS to nx_read() (2017-10-11).
	* sched/signal:  Add logic to wake up a thread that is waiting on a
	  signal if it is canceled (2017-10-12).
	* nxsig_timedwait: Add logic to suppress the wait if there is a pending
	  cancellation (2017-10-12).
	* stm32 SPI: Add missing include required when CONFIG_SPI_CALLBACK is
	  enabled.  From Anthony Merlino (2017-10-12).
	* STM32L4 RTC fixes:
	    - STM32L4 RTC: init mode was never exited because nested locking in
	      rtc_synchwait() disabled backup domain access
	    - STM32L4 RTC:  Use backup register magic value instead of INITS
	      bit.  The INITS (bit 4) of RTC_ISR register cannot be used to
	      reliably detect backup domain reset. This is because we can operate
	      our device without ever initializing the year field in the RTC
	      calendar if our application does not care about correct date being
	      set.  Hardware also clears the bit when RTC date is set back to year
	      2000.
	    - STM32L4 RTC: put back the SSR race condition workaround.  ST has
	      confirmed that the issue has not been fixed, and that it applies to
	      STM32L4 too (was not in errata sheets due to documentation bug) See
	      discussion:        https://community.st.com/thread/43710-issue-with-rtc-maximum-time-resolution
	    - STM32F4, STM32L4, STM32F7 RTC: add more CONFIG_RTC_NALARMS > 1 to
	      reduce code size
	    - STM32L4: rename stm32l4_rtcc.c to stm32l4_rtc.c to better match
	      STM32F7
	    - STM32, STM32L4, STM32F7 RTC: stray comment and typos in
	      chip/stm32_rtcc.h
	    - STM32L4 RTC: change maximum alarm time from 24h to one month
	  From Juha Niskanen (2017-10-13).
	* TCP Networking:  When CONFIG_NET_TCP_WRITE_BUFF=y there is a situation
	  where a NULL pointer may be dereferenced.  In this configuration, the
	  TCP connection's 'semi-permanent' callback, s_sndcb was nullified in
	  tcp_close_disconnect.  However, other logic in tcp_lost_connection()
	  attempt to use that callback reference after it was nullifed.  Fixed in
	  tcp_lost_connectino() by adding a NULL pointer change before the
	  access.  This was reported by Dmitriy Linikov in Bitbucket Issue 72
	  (2017-10-13).
	* stm32f7 BBSRAM: stm32_bbsram: avoid assert in stm32_bbsram_savepanic.
	  If panic happens before stm32_bbsram is initialized,
	  stm32_bbsram_savepanic caused additional assert panic. Function has null
	  pointer check, so drop DEBUGASSERT.  From Jussi Kivilinna (2017-10-13).
	* FS FAT: Fix hard-fault when listing contents of FAT root.  From Jussi
	  Kivilinna (2017-10-13).
	* configs/stm32f4discovery:  Add a USB MSC configuration.  From Alan
	  Carvalho de Assis (2017-10-13).
	* 6LoWPAN:  Correct a bug in handling uncompressed frames (IPv6
	  dispatch) (2017-10-13).
	* 6LoWPAN:  Fix a whole in the logic of the previous commit.  It turns
	  out that g_uncomp_hdrlen has other usages so it cannot be modified as I
	  was doing.  Instead, I needed to add a separate localt variable,
	  protosize, to keep track of the two usages of g_uncomp_hdrlen
	  (2017-10-13).
	* configs/: The nx and nxtext examples no longer supports single user
	  mode (2017-10-14).
	* The lcdrw example has been removed because it violates the portable OS
	  interface (2017-10-14).
	* All configurations that use NXIMAGE or NXHELLO must select
	  NX_MULTIUSER.  All configurations that use examples/nxterm must enable
	  CONFIG_LIB_BOARDCTL (2017-10-14).
	* configs/stm32f103-minimum: Add support for LM75 in the
	  stm32f103-minimum board.  From Alan Carvalho de Assis (2017-10-14).
	* configs/: All configurations that use NXLINES must select
	  NX_MULTIUSER.  All configurations that use the NX server need to have
	  larger POSIX messages (2017-10-14).
	* boardctl():  Remove the BOARDIOC_GRAPHICS_SETUP command (2017-10-15).
	* Initial ADC support for the STM32F33XX
	    - stm32_adc.h: add JEXTSEL definitions and hrtim trigger configuration
	    - stm32_adc.c: move STM32F33 ADC logic to a separate file
	  From Mateusz Szafoni (2017-10-15).
	* configs/sim: Update touchscreen driver initialization to use only
	  multiple-user NX server logic (2017-10-15).
	* configs/sim:  Convert the traveler configuration so that it uses the
	  framebuffer driver (2017-10-16).
	* task_delete():  Do not permit user applications to delete kernel
	  threads (2017-10-16).
	* kthread_create():  Rename kernel_thread() to kthread_create() for
	  better naming consistency with task_create() and kthread_delete()
	  (2017-10-16).
	* All other STM32: SHIFTR_SUBFS_MASK was correct in STM32F0 only
	    - STM32L1: use correct EXTI line definitions (2017-10-17).
	* STM32 RTC fixes:
	    - RTC: canceling an alarm marks it as inactive
	    - STM32L4, STM32F4, STM32F7 RTC: fix reading alarm value that is
	      more than 24h in future
	    - STM32F0 RTC: fix backup register count in stm32_rtcc.h
	  From Juha Niskanen (2017-10-17)
	* BCM2708: Add system timer register definitions and a partial
	  implementation of the tickless mode timer (2017-10-17).
	* BCM2708: Add support for AUX interrupts.  Add some build configuration
	  and support logic for low-level serial output (2017-10-17).
	* drivers/usbdev: Correct input flow control logic when watermarks are
	  not enabled.  Problem noedt by and change based on suggestion by Juha
	  Niskanen (2017-10-18).
	* BCM2708:  Add hooks to support both Mini- and PL011 UARTs (2017-10-18).
	* BCM2708: Fleshes out GPIO interrupt logic (2017-10-18).
	* fs/vfs:  Fix after recent changes.  write() was return negative values
	  in errno. Noted by Jussi Kivilinna (2017-10-18).
	* drivers/usbdev:  Move test for NULL pointer before the pointer is
	  deferences.  Noted by Juha Niskanen (2017-10-18).
	* net/:  Fix some build issues noted when both IPv4 and IPv6 are
	  enabled.  From Anthony Merlino (2017-10-18).
	* photon:  Support SPI1 and SPI3.  From Anthony Merlino (2017-10-18).
	* BCM2708: Allow pass parameters with AUX interrupts; Add mini-UART
	  break capability.  BCM2708: Add Mini-UART logic.  Still missing UART
	  configuration logic (2017-10-18).
	* Alexey T, Bitbuck Issue 73:  Lower part of STM32 CAN driver
	  arch/arm/src/stm32/stm32_can.c uses all three hw tx mailboxes and clears
	  TXFP bit in the CAN_MCR register (it means transmission order is defined
	  by identifier and mailbox number).

	  This creates situation when order frames are put in upper part of CAN
	  driver (via can_write) and order frames are sent on bus can be
	  different (and I experience this in wild).  Since CAN driver API
	  pretends to be "file like" I expect data to be read from fd the same
	  order it is written. So I consider described behaviour to be a bug.

	  I propose either to set TXFP bit in the CAN_MCR register (FIFO
	  transmit order) or to use only one mailbox (2017-10-19).
	* The timer frequencies (BOARD_TIMx_FREQUENCY) are incorrectly defined
	  in configs/stm3240g-eval/include/board.h.  Since the APB prescalers are
	  set to divide by 4 and 2 respectively, the frequencies should be
	  "2xAPBx" as said in the comment.  The correct frequencies are already
	  defined but as STM32_APBx_TIMx_CLKIN.  From Mattias Edlund (2017-10-19).
	* drivers/ioexpander:  The IRQ subsystem now supports passing a void *
	  parameter to IRQ handlers.  Use that method to support multiple pc9555
	  devices, by passing a pointer to the device to the board defined irq
	  handler.  Now the CONFIG_ for multiple PCA devices just allocates device
	  structures dynamically instead of statically when not enabled.

	  The same interrupt handler is entered with the device structure
	  parameter in all situations, multiple or single PCA. One should still
	  be careful if multiple PCA devices share the same IRQ.  From Sebastien
	  Lorquet (2017-10-19).
	* libc/match:  Use of exp() vs expf() in logf() caused function to be
	  slow.  From Alan Carvalho de Assis (2017-10-19).
	* drivrs/mtd/filemtd.c: add block device MTD interface.  Block MTD
	  interface allows using block device directly as MTD instead of having to
	  use file-system in between.  NOTE that this provides the opposite
	  capability of FTL which will let you use an MTD interface directly as a
	  block device.  From Jussi Kivilinna (2017-10-19).
	* There was a reference counting problem in the TPC logic of
	  net_clone().  net_clone() which is the common logic underlying dup() and
	  dup2() for sockets.  When net_clone() calls net_start_monitor() and
	  net_start_monitor() returns a failure (because the underlying TCP
	  connection) then net_clone() must back out the reference count on the
	  structure.  Problem noted by Pascal Speck and this implementation of the
	  solution is based on his suggestion (2017-10-19).
	* There was a possible recursion that could eventually overflow the
	  stack.  The error occurred when closing the socket with inet_close()
	  while a socket callback was still queued.  When the socket callback was
	  executed by devif_conn_event(), this resulted in a call to
	  psock_send_eventhandler() with TCP_CLOSE flag set which then called
	  tcp_lost_connection().  tcp_shutdown_monitor() then called
	  tcp_callback() again, which again called psock_send_eventhandler(), and
	  so on....  Noted by Pascal Speck.  Solution is also similar to a
	  solution proposed by Pascal Speck (2017-10-19).
	* nucleo-f334r8/adc: change serial console to USART2 (STLINK COM).  From
	  Mateusz Szafoni (2017-10-19).
	* stm32f33xxx_adc.c: fix some warnings and compilation error when extsel
	  not in use.  From Mateusz Szafoni (2017-10-19).
	* net/tcp:  Same change to tcp_send_buffered.c probably also applies to
	  tcp_send_unbuffered.c (2017-10-19).
	* net/tcp:  Same change to tcp_send_buffered.c probably also applies to
	  tcp_sendfile.c (2017-10-19).
	* tcp_lost_connection() is called from two places in tcp_sendfile.c
	  (2017-10-19).
	* net/tcp:  Same change to tcp_send_buffered.c probably also applies to
	  sixlowpan_tcpsend.c and inet_recvfrom.c (2017-10-19).
	* drivers/sensor: Add driver for the APDS-9960 gesture sensor.  From
	  Alan Carvalho de Assis (2017-10-20).
	* include/nuttx/sensors/ioctl: deduplicate SNIOC_CFGR.  From Jussi
	  Kivilinna (2017-10-20).
	* drivers/sensors/hts221: power-on sensor for loading calibration data.
	  From Jussi Kivilinna (2017-10-20).
	* arch/arm/src/stm32f7/i2c: fix I2C_M_NORESTART handling.  From Jussi
	  Kivilinna (2017-10-20).
	* drivers/sensors/apds9960.c: Use work_queue to read/process data when
	  receive an IRQ.  From Alan Carvalho de Assis (2017-10-20).
	* STM32L1, STM32L4 RTC: add periodic interrupts, update L1 RTC
	  implementation
	    - STM32L4 RTC: add support experimental CONFIG_RTC_PERIODIC
	    - STM32 RTC: separate STM32L1 RTC into a separate file
	  STM32L1 RTC is very close to F4 or L4 versions, with two alarms and
	  periodic wakeup support so backported L4 peripheral to L1.
	    - RTC: Add periodic alarms to upper and lower halves
	 From Juha Niskanen (2017-10-20).
	* stm32_adc.c: clear pending interrupts.  From Mateusz Szafoni
	  (2017-10-20).
	* drivers/bch:  The character driver to block device access now supports
	  an IOCTL to get the geomtry of the underlying block device (2017-10-20).
	* fs/fat:  Remove mkfatfs from the OS.  This is a user-space application
	  and belongs in apps, not in the OS (2017-10-20).
	* configs/nucleo-f334r8: add logic for zero latency high priority
	  interrupts example.  From Mateusz Szafoni (2017-10-22).
	* Misc STM32 chagnes
	    - STM32 HRTIM:  Fix warnings related with RCC
	    - STM32F33xxx ADC:  Add some publicly visable interfaces and some
	      code to support injected channels
	    - STM32F33xxx DMA:  Add public interface to handle with DMA interrupts
	  From Mateusz Szafoni (2017-10-22).
	* stm32f103-minimum:  Add an ADPS-9960 example configuration.  From Alan
	  Carvalho de Assis (2017-10-23).
	* net/icmp: This change adds support for semi-standard IPPROTO_ICMP
	  AF_INET datagram sockets.  This replaces the old ad hoc, nonstandard way
	  of implementing ping with a more standard, socket interface (2017-10-23).
	* net/inet:  Add check for protocol before handing out TCP and UDP
	  sockets (2017-10-23).
	* arch/arm/common/up_checkstack: fix assert panic when both TLS and
	  interrupt stack are enable.  From Jussi Kivilinna (2017-10-23).
	* net/icmp:  Correct some comments, typings, spacing problems from last
	  big ICMP socket change (2017-10-23).
	* configs/:  All defconfig filess that include
	  CONFIG_NET_ICMPv6_SOCKET=y need to select CONFIG_SYSTEM_PING6=y and
	  deselect CONFIG_DISABLE_POLL (2017-10-24).
	* net/icmpv6: This commit adds support for semi-standard IPPROTO_ICMP6
	  sockets.  This is a replacement for the non-standard ICMPv6 ping support
	  that violated the portable POSIX OS interface (2017-10-24).
	* mm/mm-heap: memalign: fix heap corruption caused by using unaligned
	  chuck size.  Unaligned nodes generated by memalign later cause heap
	  corruptions when nodes are shrink further (for example, 24 bytes -> 8
	  bytes, when alignment is 16 bytes).  From Jussi Kivilinna (2017-10-24).
	* lm3s8962:  NX configuration needs CONFIG_NXSTART_EXTERNINIT=y
	  (2017-10-24).
	* sched/:  move POSIX thread specific data from pthread TCB to common
	  TCB structure.  This change allows using
	  pthread_getspecific/pthread_setspecific from main thread. Patch also
	  enables using pthread data with config option CONFIG_DISABLE_PTHREAD=y.
	  From Jussi Kivilinna (2017-10-25).
	* net/local: fix typo in config macro name.  From Juha Niskanen
	  (2017-10-25).
	* Olimex stm32-h407 serial support for the on-board UEXT connector
	  (fixed style & defconfig).  Add USART6 for UEXT connector.   Add
	  nsh_uext configuration and README update.  From Jan Pobříslo (2017-10-26).
	* configs/nucleo-l496zg/nsh: enable I2C4 bus with i2ctool.  From Jussi
	  Kivilinna (2017-10-26).
	* arch/arm/stm32f7: i2c: restore bus frequency after I2C reset.  Copy
	  frequency restoration fix from STM32L4 I2C driver to STM32F7 I2C
	  driver.  From Jussi Kivilinna (2017-10-26).
	* arch/stm32l4: port STM32F7 I2C driver to STM32L4.  STM32L4 I2C driver
	  is in work-in-progress state (plentiful of TODOs and #warnings) and lags
	  many features found in more up-to-date STM32 I2C drivers. The peripheral
	  on STM32F7 and STM32L4 are identical except for L4's 'wakeup from stop
	  mode' flag and STM32F7's I2C driver is in more 'ready to use' state.

	  Commit ports the STM32F7 I2C driver to STM32L4. The I2C clock
	  configuration is kept the same as before (I2CCLK = PCLK1 80 Mhz)
	  instead of switching to STM32F7 arch default that is I2CCLK=HSI.
	  Further work would be to add configuration option for choosing I2C
	  clock source instead of current hard-coded default.  From Jussi
	  Kivilinna (2017-10-26).
	* drivers/sensors/lis2dh: fixes for self-test.  From Jussi Kivilinna
	  (2017-10-26).
	* include/nuttx/fs/:  Move prototype of foreach_mountpoint out of
	  include/nuttx/fs/fs.h to fs/mount/mount.h (2017-10-26).
	* fs/mount:  Implements procfs /proc/fs/blocks and /proc/fs/usage files,
	  replacing the NSH df command.  Also implements procfs /proc/fs/mount
	  file, replacing the NSH mount command when there are no arguments
	  (2017-10-26).
	* Correct a problem that was causing an apparent directory to be
	  reported as a file instead of a directory by opendir.  This happened
	  after adding these three new procfs entries: fs/block, fs/mount, and
	  fs/usage.  Of course, there is no directory fs in this case, only three
	  files that have fs/ in their relative pathnames.  The logic was
	  detecting that fs was the name of the enty to report, but it was then
	  declaring that fs was a file (because fs/block is of type file).  This
	  was fixed by adding a check for matching lenghts.  i.e., if strlen(fs)
	  != strlen(fs/block), then report fs as a directory instead of a file
	  (2017-10-26).
	* fs/procfs: Missing some conditional logic for cases where mountpoint
	  procfd entries excluded (2017-10-27).
	* drivers/can/mcp2515.c: Fix the MCP2515 Bit Rate Prescale
	  calculation.   Fix BRP for SET_BITTIMING ioctl as well.  From Alan
	  Carvalho de Assis (2017-10-27).
	* sensors/lis2dh:  Fix use of obsolete dbg macro.  From Jussi Kivilinna
	  (2017-10-27).
	* nucleo-f334r8:  Add highpri example configuration.  From Mateusz
	  Szafoni (2017-10-28).
	* STM32 F33xx:  Add ADC DMA support to STM32F33 configuration.  From
	  Mateusz Szafoni (2017-10-28).
	* drivers/net:  Remove the old, unfinished Crystal LAN driver.  I don't
	  even have the hardware that it goes with anymore (2017-10-28).
	* configs/mx1ads:  This commit removes board support for the mx1ads
	  board.  That board support was never completed and I no longer even have
	  the hardware.  The unfinished board support is still available in the
	  Obsoleted repository if anyone would ever like to resurrect it
	  (2017-10-28).
	* STM32 ADC:  Added support for ADC's IO_ENABLE_TEMPER_VOLT_CH ioctl on
	  STM32F10XX and STM32F20XX.  From Dmitriy Linikov (2017-10-30).
	* STM32 F2: Fixed build for STM32F20XX platforms when
	  CONFIG_STM32_DMACAPABLE is enabled.  From Dmitriy Linikov (2017-10-30).
	* fs/userfs:  This completes coding of the UserFS client and of the
	  UserFS feature in general.  This feature is being merged to main now
	  because I believe it is innocuous.  It is, however, untesed.  The next
	  step will be to develop a test case to verify the feature.  Uses Unix
	  domain local sockets instead of message queues.  Easier to transfer big
	  data in local sockets than message queues (2017-10-30).
	* Fix DEBUGASSERT() issues with nxhello on lc823450-xgevk
	    - sched/task: Remove DEBUGASSERT in task_exitstatus() and
	      task_groupexit()
	    - graphics: Change DEBUGASSERT condition in nx_runinstance()
	  From Masayuki Ishikawa (2017-10-31).
	* Fix GPIO operation of STMPE811 driver.
	  1. STMPE811_GPIO_DIR was defined for register name and later was
	  redefined to be the pin direction mask for `stmpe811_gpioconfig`.  I
	  decided to change register name to be STMPE811_GPIO_DIR_REG, and keep
	  pin direction mask STMPE811_GPIO_DIR, so that any external code that
	  already use this driver will be unchanged.
	  2. The STMPE811 register GPIO_DIR uses bit value 1 for output and 0
	  for input, but `stmpe811_gpioconfig` set the opposite.
	  3. The call to `stmpe811_gpiowrite` from inside of
	  `stmpe811_gpioconfig` leaded to deadlock.
	  From Dmitriy Linikov (2017-10-31).
	* sim/userfs:  Add a configuration for testing the UserFS using
	  apps/examples/userfs (2017-10-31).
	* Fixes a memory leak that is caused because the client message queue is
	  not unlinked after the client disconnects from the NX server.  From
	  Masayuki Ishikawa (2017-10-31).
	* drivers/wireless/ieee80211:  Fix typos and spelling errors as needed
	  for Photon build.  From Anthony Merlino (2017-11-01).
	* net/icmpv6:  Add some header file necessary for correct build.  From
	  Anthony Merlinoo (2017-11-01).
	* libc/userfs: Correct return value from dispatchers.  Should return
	  zero on success, not the number of bytes sent (2017-11-01).
	* net/ipforward: Fixes typo that caused build error when IP forwarding
	  was enabled with CONFIG_NET_ICMPv6_NEIGHBOR enabled as well.  From
	  Anthony Merlino (2017-11-01).
	* ieee802154: Simplifies notify() and rxframe() calls to a single
	  notify() call. dataind's and all other "notifs" are now "primitives"
	  which aligns with standard terminology  From Anthony Merlino (2017-11-01).
	* fs/userfs: Correct check for response type (2017-11-01).
	* net/local: This commit modifies the Unix domain local socket design.
	  Local sockets are built on top of pipes.  The Local socket
	  implementation maintained file descriptors to interrupt with the pipes.
	  File descriptors have the bad property that they are valid only while
	  running on the thread within the task that created the local socket.

	  As a policy, all internal OS implementations must use "detached" files
	  which are valid in any context and do not depend on the validity of a
	  file descriptor at any point in time.  This commit converts the usage
	  of file descriptors to detached files throughout the local socket
	  implementation (2017-11-02).
	* fs/userfs:  There are some deadlock issues that make the UserFS
	  un-usable at the current time.  Added to the TODO list; also feature is
	  now marked EXPERIMENTAL (2017-11-02).
	* drivers/serial/serial.c:  Optimize wait time in tcdram() for buffer
	  emptying.  According to the specification, the close function must wait
	  until all data has been written before it closes the file (except
	  O_NONBLOCK is set). The maximum waiting time for this is not specified.

	  To be able to edit the file list of the process, the close function
	  has to lock the file list semaphore. After that the close function of
	  the serial driver is called.

	  Waiting for the complete transmission of all data is done in the
	  serial driver.  This causes the semaphore to remain locked until all
	  data has been sent.  However, no other thread of the process can edit
	  the file list for that time  (open, close, dup2, etc.). This is not
	  optimal in a multithreaded environment.  Therefore, we have to keep
	  the waiting time within the driver as short as possible.  From Frank
	  Benkert (2017-11-02).
	* drivers/loop: Don't use file descriptors... Use the internal file
	  system interfaces so that the loop device can be shared across threads
	  (2017-11-02).
	* drivers/mtd/filemtd.c: Don't use file descriptors... Use the internal
	  file system interfaces so that the loop device can be shared across
	  threads (2017-11-02).
	* mac802154: Fixes a warning for unused variable and returns -1 from
	  macnet_notify() if event is not used.  From Anthony Merlino (2017-11-03).
	* drivers/lcd/max7219.c: Add support to MAX7219 LED Matrix as LCD
	  interface.  From Alan Carvalho de Assis (2017-11-04).
	* configs/stm32f103-minimum: Add board support for MAX7219 LED Matrix
	  controller.  From Alan Carvalho de Assis (2017-11-04).
	* stm32f334-disco, nucleo-f334r8: add missing ram_vectors configuration
	  in linker script.  From Mateusz Szafoni (2017-11-04).
	* Kconfigs: Add CONFIG_LCD_UPDATE that works like CONFIG_NX_UPDATE but
	  can be enabled without enabling the graphics subsystem (2017-11-04).
	* SAMv71-XULT:  Remove non-functional framebuffer configuration
	  (2017-11-05).
	* stm32f103-minimum: Remove warning when selecting MMCSD support, Add
	  board_usbmsc_initialize to stm32f103-minimum.  From Alan Carvalho de
	  Assis (2017-11-05).
	* nucleo-f334r8/highpri: missing ADC trigger configuration.  From
	  Mateusz Szafoni (2017-11-05).
	* stm32f334-Disco: beginning of lower-half driver for SMPS (buck-boost
	  onboard converter).  From Mateusz Szafoni
	* Misc. STM32 Fixes:
	    - STM32 HRTIM: add helper macros
	    - STM32F33xxx ADC: injected channels support, fix some definitions,
	      add interface to disable interrupts
	  From Mateusz Szafoni (2017-11-05).
	* fs/userfs:  This commit converts the underlying IPC used by the
	  UserFS from Unix domain local sockets to UDP LocalHost loopback
	  sockets.  The problem with the local sockets is that they do require
	  operations on the top level psuedo-file system inode tree.  That tree
	  must be locked during certain traversals such as enumerate mountpoints
	  or enumerating directory entries.

	  This conversion is unfortunate in the sense that Unix local domain
	  sockets are relatively lightweight.  LocalHost UDP sockets are much
	  heavier weight since they rely on the full UDP stack.  If anyone is
	  up for a complete redesign, then using some shared memory and a POSIX
	  message queue would be lightweight again.

	  This commit also fixes several bugs that were not testable before the
	  inode tree deadlock.  I cannot say that the logic is 100% stable but
	  it does not have basic functionality (2017-11-05).
	* fs/userfs:  Fix return value from dup method.  In order to return a
	  pointer, the parameter must be a pointer to a pointer (2017-11-06).
	* configs/stm32f429i-disco/ltdc:  This configuration has been deleted
	  because it violated the portable POSIX OS interface.  It used
	  apps/examples/ltdc and include ltdc.h and dma2d.h which were also
	  removed for the same reason (2017-11-06).
	* arch/arm/include/stm32 and stm32f7:  Remove ltdc.h and dma2d.h.
	  Those header files in that location permitted inclusion into
	  application space logic and, hence, facilitated and encouraged calling
	  into the OS and violating the portable POSIX OS interface.  The
	  definitions in those header files were move the appropriate location in
	  the counterpart, architecture specific files at arch/arm/src/stm32 and
	  stm32f7 dma2d.h and ltdc.h (2017-11-06).
	* lpc43xx Ethernet:  Fix some backward logic setting full-duplex and
	  100mbps when autoconfiguration is disabled.  Noted by Anonymous in
	  Issue #76 (2017-11-06).
	* sched/sched/sched_cpuselect.c:  For SMP, In order to find the cpu
	  with the lowest priority thread, we have to remember the already found
	  lowest priority.  Noted by Anonymous in Issue #75 (2017-11-06).
	* Add IPL2 support for LC823450
	    - arch/arm/src/lc823450: Add IPL2 support
	    - configs/lc823450-xgevk: Add IPL2 support
	  From Masayuki Ishikawa (2017-11-07).
	* drivers/audio: Add WM8774 support.  From Masayuki Ishikawa
	  (2017-11-08).
	* lc823450-xgevk audio support
	    - arch/arm/src/lc823450: Add IPL2 support
	    - configs/lc823450-xgevk: Add IPL2 support
	    - libc/audio: Fix compilation error in lib_buffer.c
	    - arch/arm/src/lc823450: Add I2S support
	    - configs/lc823450-xgevk: Add WM8774 support
	  From Masayuki Ishikawa (2017-11-08).
	* drivers/usbdev/rndis.c: fix packet receiving logic.  The logic didn't
	  take single-byte termination frames in account.  From Sakari Kapanen
	  (2017-11-08).
	* net/icmpv6/icmpv6_radvertise.c: Add option to manually specify router
	  prefix.  From Sakari Kapanen (2017-11-08).
	* net/icmpv6/icmpv6_radvertise.c: set the prefix length to
	  preconfigured value (2017-11-08).
	* STM32 L4 RCC: restore backup-registers after backup-domain reset.
	  From Jussi Kivilinna (2017-11-08).
	* STM32 L4: Build stm32l4_idle.c only if  CONFIG_ARCH_IDLE_CUSTOM is
	  not enabled.  From Jussi Kivilinna (2017-11-08).
	* drivers/power/bq2429x.c: Add BATIO_OPRTN_SYSON for enabling BATFET
	  after SYSOFF.  From Jussi Kivilinna (2017-11-08).
	* lc823450 auto LED support
	    - arch/arm/src/lc823450: Add auto LED for CPU activity
	    - configs/lc823450-xgevk: Add auto LED support
	  From Masayuki Ishikawa (2017-11-09).
	* tools/configure.sh: This commit adds a -m option for macOS. For
	  anyone not aware, Apple renamed OSX to macOS recently; thus the 'm'
	  instead of 'o'. This does not change the other uses of *_OSX to macOS.
	  From jeditekunum (2017-11-09).
	* tools/configure.c:  Update functionality to match last change to
	  tools/configure.sh (2017-11-10).
	* STM32L4 serial PM interface improvements:  Check rx/tx buffers for
	  pending data in pmprepare.  Remove adhoc PM interfaces and move serial
	  suspend functionality behind CONFIG_PM.  From Jussi Kivilinna
	  (2017-11-10).
	* procfs: Fix uptime being clse to maximum 32-bit value in certain
	  config.  From Juha Niskanen (2017-11-10).
	* libc:  Add support for readv() and write(). Also includes some
	  cosmetic changes to some unrelated files (2017-11-11).
	* libc/signal:  Add support for sigwait() (2017-11-11).
	* sched/signal/sig_nanosleep.c and libc/time/lib_nanosleep.c:
	  Implement clock_nanosleep().  nanosleep() is now reduced to a libc
	  wrapper around clock_nanosleep() (2017-11-11).
	* Changes from review of clock_nanosleep():  Misplaced right bracket,
	  but return value in one failure case (2017-11-11).
	* include/netinet/tcp.h:  Add trivial standard tcp.h header file
	  (2017-11-12).
	* Trivial re-ordering of socket option bit numbers to match order
	  presented on OpenGroup.org (2017-11-12).
	* arch/arm/src/stm32/stm32f33xx_adc.c:  Eliminate warnings about
	  cj_channels and j_chanlist being set but not used (2017-11-12).
	* configs/stm32l476-mdk: Add support for the on-board LEDs (2017-11-12).
	* include/netinet/tcp.h:  Add trivial standard tcp.h header file
	  (2017-11-12).
	* configs/stm32l476-mdk:  Repartition bring-up logic so that it is more
	  like other board directories.  Add support for USERLED driver.  Add
	  bring-up initialization logic for the USERLED driver (2017-11-12).
	* drivers/usbdev/rndis.c:  Fix some issues in rndis.c  Introduce
	  rndis_transmit() and change rndis_rxdispatch() to avoid packet
	  corruption. Introduce max packet size for dual speed whichis mainly
	  used for high speed mode. Fix adjusting MTU warning on Linux host. Fix
	  data corruption if a packet size excceds MTU.  NOTE: Max packet size is
	  not configured dynamically. This should be fixed in the future
	  version.  Change HPWORK to ETHWORK.  NOTE: In the commit 07b98ccbb5,
	  max packet size of bulkout was assumed to be 64. In this commit,
	  priv->epbulkout->maxpacket is used instead.  From Masayuki Ishikawa
	  (2017-11-13).
	* configs/stm32f4discovery: RNDIS support on STM32F4Discovery
	    - Add rndis configuration.  NOTE: STM32F4Discovery + DM-STF4BB
	    - Add stm32_netinit.c to avoid a compilation error
	    - Add rndis initialization in stm32_bringup.c
	  NOTE: MAC address for the host side starts 0xaa.  This assignment
	  scheme should be fixed later.  From Masayuki Ishikawa (2017-11-13).
	* configs/:  apps/system/free has been deleted because it violates the
	  portable POSIX OS interface.  Remove CONFIG_SYSTEM_FREE=y from all
	  defconfig files (2017-11-13).
	* fs/procfs/fs_procfsprogrem:  Add /proc/progmem.  This is an
	  alternative way to get the information that was previoulsy available in
	  apps/system/free.  apps/system/free was removed beause it made illegal
	  calls into the OS violating the portable interface.  This new procfs
	  entry provides the same information with no such violation (2017-11-13).
	* Nucleo-F746ZG: Use the serial console over /dev/ttyACM0 by default.
	  The Nucleo-F746ZG doesn't come with Arduio RS-232 shield, then it is
	  better to use the serial over the /dev/ttyACM0 that is created
	  automatically when the board is plugged in the computer.  From Alan
	  Carvalho de Assis (2017-11-13).
	* SAMA5/SAMv7:  It is necessary to disable pre-emption and interrupts
	  around a loop that copies TX data into the hardware in order to avoid a
	  TX data underrun condition.  From Anthony Merlino (2017-11-13).
	* fs/profcs:  Add file to show user space heap.  This replaces the NSH
	  free command (2017-11-13).
	* fs/procfs:  Optimization of previous commits.  /proc/umm and
	  proc/progmem are deleted.  /proc/kmm is renamed /proc/meminfo and
	  contains the output that was in all three files previously (2017-11-13).
	* configs/stm32f439i-disco:  Add an fb configuration (2017-11-13).
	* configs/stm32f429i-disco/fb:  Fix a compile issue.  Disable all NX
	  features in the fb configuration.  NX is not needed (2017-11-13).
	* configs/stm32f429i-disco/fb:  Refactor initialization logic so that
	  it is a little more like other boards.  Remove double initialization of
	  framebuffer or LCD drivers (whichever is enabled) (2017-11-13).
	* configs/stm32f429i-disco:  Add logic to auto-mount procfs.  Enable
	  procfs in all configurations that use NSH (2017-11-13).
	* configs/stm32f429-disco/fb:  Enable support for the STMPE811
	  touchscreen controller and also for the apps/exmaples/touchscreen test
	  (2017-11-14).
	* Remove CONFIG_GRAN_SINGLE.  It adds no technical benefit (other than
	  some minor reduction in the number of interface arguments) but adds a
	  lot of code complexity.  Better without it (2017-11-14).
	* mm/mm_gran:  Add a function to get information about the state of the
	  granuale allocator (2017-11-14).
	* fs/procfs:  Add logic to show the state of the page allocator in
	  /proc/meminfo (2017-11-14).
	* mm/mm_gran:  Fix some issues found during test of the new gran_info()
	  interface (2017-11-14).
	* configs/stm32429i-disco/src:  Fix a compile error when
	  CONFIG_BOARD_INITIALIZE is defined (2017-11-14).
	* configs/lc823450-xgevk: Fix compilation errors on Cygwin.  From
	  Masayuki Ishikawa (2017-11-15).
	* mm/mm_gran:  Combine some common logic into a function (also fixes a
	  subtle bug) (2017-11-15).
	* Build system:  Fix CONFIG_BUILD_KERNEL logic directories that have
	  ubin and kbin subdirectories.  Conditional logic was fine for
	  CONFIG_BUILD_FLAT and CONFIG_BUILD_PROTECTED but generated useless
	  dependencies if CONFIG_BUILD_KERNEL (2017-11-15).
	* arch/arm/src/lpc43: Add LPC43xx CAN driver.  From Alexander Vasiljev
	  (2017-11-15).
	* arch/arm/src/lpc43: UART_RX pins should be configured with input
	  buffers enabled. Otherwise it cannot be read.  From Alexander Vasiljev
	  (2017-11-15).
	* STM32F429i-Disco: Convert NxWM configuration to use LTDC framebuffer
	  driver instead of SPI serial.  Also reduce number of layers from 4 to 1
	  in fb configuration.  Only one layer is used (2017-11-15).
	* configs/stm32f429i-disco/ide:  Remove the uVision IDE setup that goes
	  along with the ltdc configuration that was removed on 2017-10-28
	  (2017-11-16).
	* configs/stm3220g-eval/ide:  Remove the uVision IDE setup.  This has
	  not been used for years and it a maintenance problem for me (2017-11-16).
	* arch/arm/src/xmc4: Fix XMC4xxx USIC UART sginal to be high level when
	  in idle.  From Alan Carvalho de Assis (2017-11-16).
	* arch/arm/src/xmc4: Kconfig was not selecting XMC4_USIC for USIC1.
	  From Alan Carvalho de Assis (2017-11-16).
	* configs/xmc4500-relax: Add config for UART3 on RXD P0.0 and TXD P0.1
	  pins.  From Alan Carvalho de Assis (2017-11-16).
	* STM32 F72xx and F73xx:  Add register definition header files and
	  clocking logic.  From Bob Feretich (2017-11-17).
	* STM32F7:  Fix typos in two RCC register definition header files.
	  From Bob Feretich (2017-11-17).
	* STM32F7:  Completes architecture support for the STM32 F72x and F73x
	  families.  Adds support for the Nucleo-144 boards with STM32F722.  From
	  Bob Feretich (2017-11-18).
	* configs/sim:  Disable NX graphics support in the fb configuration.
	* libnx:  Changes to allow the font subsystem to be built without
	  enabling the entire graphics system (CONFIG_NX).  Adds CONFIG_NXFONTS
	  and CONFIG_NXGLIB.  NX and NXFONTS are still pretty heavily entangled.
	  Needed to duplicate some Kconfig setting for NXFONTs if it can be
	  configured and built independently of NX.  Also includes some
	  build-related fixes (2017-11-18).
	* configs/mcb1700: Add support for Keil MCB1700 board.  From Alan
	  Carvalho de Assis (2017-11-18).
	* configs/open1788/pdcurses:  Add a configuration for testing pdcurses
	  (2017-11-19).
	* C library: Fix sscanf character conversion (%c): do not add '\0' at
	  the end as for strings, cause, for example, parsing one character will
	  fill two bytes: character itself and zero one '\0' after it, so will
	  overflow one byte variable argument and corrupt memory for variables
	  allocated after it.  From Oleg Evseev (2017-11-19).
	* arch/arm/src/xmc4:xmc4_uart_configure() expects the channel# not
	  uartbase as an input parameter.  From Alan Carvalho de Assis
	  (2017-11-20).
	* configs/open1788:  Add support for the discrete joystick driver.
	  Update the pdcurses configuration to use apps/examples/djoystick
	  (2017-11-20).
	* net/icmpv6:  icmpv6_input() needs to set d_len to 0 after consuming
	  echo reply, otherwise, garbage will get sent out.  From Anthony Merlino
	  (2017-11-20).
	* configs/open1788:  Enable discrete joystick input.  This is
	  sufficient to get through all menuing that does not require text input
	  (2017-11-20).
	* net/sixlowpan:  Fix an endian-ness problem in 6LoWPAN address
	  decompression.  From Anthony Merlino (2017-11-20).