ReleaseNotes

        Pettit.

    * Networking:

      - Driver Statistics: Most network drivers do not support statistics.
        Those that do only supported them when DEBUG is enabled.  Each
        driver collected an architecture specific set of statistics and
        there was no common mechanism to view those statistics.  Thus,
        the driver feature was mostly useless.  This release standardizes
        the driver statistics and puts the definition in the common network
        device structure defined in netdev.h where they can be accessed by
        network applications.  All Ethernet drivers that collect statistics
        have been adapted to use these common statistics.

    * Simulation Platform:

      - W25 FLASH:  Added support for W25 FLASH simulation. From Ken Pettit.
      - HOSTFS: Added support for the HOSTFS file system (see "File Systems",
        above).

    * Atmel SAMV7:

      - SAME70:  Added support for the SAME70 family of chips.
      - Tickless: SAMV7 now supports the tickless mode of operation.

    * Atmel SAMV7 Drivers:

      - MPU:  Added MPU and protected build support.
      - QSPI:  Added a QuadSPI FLASH driver.  This driver operates in the
        memory-mapped, Serial Memory Mode (SMM).
      - FLASH:  Added support to write on-chip FLASH.
      - Timer/Counter:  TC driver ported to SAMV7 from the SAMA5.  Free-running
        and one-short timer logic also ported.
      - PCK: Brought programmable clock (PCK) logic from SAMA5 into SAMV7.
      - Timer/Counter:  Support PCK6 as an optional source for the timer/
        counter clock.

    * Atmel SAMV7 Boards:

      - SAME70-Xplained:  Add NSH and networking configurations for the
        SAME70 Xplained board.  Includes verified support for serial console,
        LEDs, buttons, SDRAM, HSMCI SD card, and networking.
      - SAMV7-XULT and SAME70-Xplained: If Tickless mode is selected then
        enable PCK6 as a timer/counter clock source

    * STMicro STM32:

      - CCM PROCFS: Is no longer a part of the 'base' procfs entries and can
        now only be supported via run time registration with
        CONFIG_FS_PROCFS_REGISTER=y.

    * STMicro STM32 Drivers:

      - Timers:  Add a compatible lower-half timer driver for use with the
        common timer upper-half driver.  From Wail Khemir.

    * STMicro STM32 Boards:

      - STM32F4-Discovery: Add low level support for the Zero Cross driver
        for the STM32F4-Discovery.  From Alan Carvalho de Assis.
      - STM32F4-Discovery: Add board config to support for the MAX6675. From
        Alan Carvalho de Assis.

    * C Library/Header Files:

      - bsearch():  Added the bsearch() function from NetBSD.
      - freopen():  Added support for freopen().
      - strftime():  Added day-of-week support (when avaialable).

    * Tools:

      - nxstyle: Add crappy style checking tool nxstyle.c.  See thee tools/
        README file for more info.

    * Applications: NSH

      - mksmartfs command: Add configuration option to supported multiple
        rootdirectories. From Ken Pettit.
      - Add support for 'basename' and 'dirname' commands.
      - set command:  Like bash, NSH set command now strips off any leading
        or trailing whitespace.
      - mount command: The mount commands now accepts mount options
        (currently needed only for the hostfs file system).  From Ken
        Pettit.
      - losetup command:  NSH no longer calls losetup() and loteardown
        directly. Now it opens /dev/loop and accomplishes these things
        using ioctl() calls.
      - ifconfig command:  If CONFIG_NETDEV_STATISTICS=y, then print the
        network driver statistics in the ifconfig.
      - ifconfig, ifup, and ifdown:  These commands now uses /proc/net/<dev>
        to view network device configuration and status and /proc/net/stat
        to show network statistics.  A consequence of this is that you
        cannot view this network information if the procfs is not enabled
        and mounted at /proc.
      - losmart command:  Added a new NSH losmart command.  losmart setups
        up a loop device for the smart MTD driver similar to losetup but
        with different syntax.  From Ken Pettit.
      - ps command:  The 'ps' command now uses /proc/<pid>/ to obtain task
        status information.  A consequence of this is that you cannot use
        the 'ps' command if the procfs is not enabled and mounted at /proc.
 
    * Applications: apps/system:

      - apps/system/hexed:  Port the hexed command line hexadeciamal editor
         to Nuttx.  See http://apps.venomdev.net/hexed/.

    * Applications: apps/fsutils:

      - apps/fsutils/smartfs: Move into apps/fsutils from kernel, now uses
        only open and ioctl.  From Ken Pettit.

    * Applications: apps/examples:

      - apps/examples/fstest:  Add a generic file system test.  This is
        essentially the same as examples/smart, but has all of the SmartFS
        specific logic ripped out.  This was created for testing the new
        TMPFS.
      - apps/examples/zerocross: Add a Zero Cross application example. From
        Alan Carvalho de Assis.
      - apps/examples/media:  Add a simple test for access of media via a
        block driver or MTD driver.

Bugfixes.  Only the most critical bugfixes are listed here (see the
ChangeLog for the complete list of bugfixes and for additional, more
detailed bugfix information):

    * Core OS:

      - Fixed an error in clock_timespec_subtract().  Found by Lok.
      - pthreads: CRITICAL BUGFIX: Logic was wiping out the indication that
        of the type of a pthread.  Hence, it could be confused as a task.
        Found because this was causing a crash when /proc/nnn/cmdline was
        printed.

    * File System/Block Drivers:

      - SMART MTD: Fix some Smart wear-leveling bugs.  Fixed SmartFS wear
        level error that occurs when the logical sector size is too small to
        save all wear level status bytes in a single sector.  Logical
        sectors 1 and 2 were simply not being allocated and then the
        read_sector and write_sector routines were failing.  From Ken
        Pettit.

    * Graphics/Graphic Drivers:

      - ILI9432:  Fixed errors in orientation. Portrait, RPortrait, and 
        Landscript should work correly now.  They were displayed mirrored.
        From  Marco Krahl.

    * Common Drivers:

      - CAN:  Fix a problem in the CAN upper-half driver that occurs only
        for CAN hardware that support a H/W FIFO of outgoing CAN messages.
        In this case, there can be a hang condition if both the H/W and
        S/W FIFOs are both full.  In that case, there may be no event to
        awaken the upper half driver.  Add a new (conditional) CAN upper
        half interface called can_txready() that can be used by the lower
        half driver to avoid this hang condition.
      - MS58xx:  Fix some issues with initialization and with CRC
        calculation.  From Karim Keddam.
      - W25: Fixed W25 FLASH driver page read/write logic. From Ken Pettit.

    * Atmel SAMV7 Drivers:

      - USART1 pin configuration: Reconfigure System I/O when using USART1.
        From Frank Benkert.
      - MCAN:  Added a call to can_txready() to the MCAN driver.

    * STMicro STM32 Drivers:

      - stm32 F4:  Fix some TIM12 pin mappings.  From Max Kriegleder.

    * STMicro STM32 Boards:

      - STM32F429i-Disco:  Calculated partition boundries based on page
        block sizes but mtd_partition() is expecting calculations based on
        erase block size. From Alan Carvalho de Assis.

    * C Library/Header Files:

      - sys/types.h: When building on a 64-bit machine, the size of size_t
        should be 64-bits. In general, I believe that sizeof(size_t) should
        be the same as sizeof(uinptr_t).  mmsize_t should always be 32-bits
        in any event.  The last change to stddef has been backed out.  With
        these changes, the simulator builds without errors or warnings an a
        64-bit machine.

    * Applications: apps/nshlib:

      - The I/O buffer, g_iobuffer, should not be a global buffer.  That
        will not work in an environment where there are multiple NSH
        sessions.  The I/O buffer must, instead, be a part part of the
        session-specific data defined in nsh_console.h.

NuttX-7.14 Release Notes
------------------------

The 114th release of NuttX, Version 7.14, was made on January 28, 2016,
and is available for download from the Bitbucket.org website.  Note
that release consists of two tarballs:  nuttx-7.14.tar.gz and
apps-7.14.tar.gz.  These are available from:

    https://bitbucket.org/patacongo/nuttx/downloads
    https://bitbucket.org/nuttx/apps/downloads

Both may be needed (see the top-level nuttx/README.txt file for build
information).

Additional new features and extended functionality:

    * Core OS:

      - modules:  Add support for kernel modules:  insmod, rmmod, support
        functions.  procfs support for user lsmod functioniality.
      - SIGEV_THREAD:  Add support for the SIGEV_THREAD notification method
        in struct sigevent.  This initial implementation will only work in
        the FLAT build since it utilizes the work queue for signal
        callbacks.  See the top-level TODO file for additional details.
      - 64-Bit Timer:  If the 64-bit timer is selected, then use it whenever
        clock_systimer() is called rather then chopping the 64-bit timer
        down to 32-bits.  Add a new type, systime_t to represent the 32- or
        64-bit system timer. This eliminates clock_systimer32() and
        clock_systime64(); there is now only clock_systimer().

    * Common Device Drivers:

      - Telnet Driver: Move the Telnet driver from apps/ to
        nuttx/drivers/net.  It is a driver a belongs in the OS.   Now works
        like the loop device:  A new interface called telnet_initialize()
        registers a telnet session "factory" device at /dev/telnet.  Via
        ioctl, the factory device can create instances of the telnet
        character devices at /dev/telnetN to support Telnet sessions.
      - PCA9635PW:  Add a driver for the PCA9635PW I2C LED driver IC which
        can be used to control the intensity of up to 16 LEDs.  From
        Alexander Entinger.
      - MCP9844: Driver for the MCP9844 I2C digital temperature sensor with
        a selectable resolution.  From Alexander Entinger.
      - PN532: Add driver for the NXP PN532 NFC-chip.  From Janne Rosberg
        and others at Offcode Ltd.
      - LSM9DS1:  Add driver for the STMicro LSM9DS1 chip. The LSM9DS1 is a
        system-in-package featuring a 3D digital linear acceleration sensor,
        a 3D digital angular rate sensor, and a 3D digital magnetic sensor.
        From Paul Alexander Patience.
      - CAN Interface:  Add more extensive error reporting capaibility to
        the CAN interface definitions.  From Frank Benkert.
      - SPI Interface:  Add an optional hwfeatures() method to the SPI
        interface.

    * Simulation Platform:

      - NSH configuration uses the custom start up scriptwith a read-only
        passwd file.  Includes hooks for an MOTD message.

    * ARMv7-R

      - ARMv7-R:  Add basic architecture support for the ARMv7-R processor
        family.

    * Atmel AVR:

      - Atmega2560:  Add support for the Atmega2560.  From Dimitry Kloper.
      - debug.h: Add an AVR-specific header file used when the AVR MEMX
        pointer is used.  From Dimitri Kloper.

    * Atmel AVR Boards:

      - Arduino-Mega2560: Add support for the Arduino-Mega2560.  From
        Dimitry Koper.

    * Atmel SAMV7 Drivers:

      - Port the TRNG driver from the SAMA5D3/4 to the SAMV7.
      - Port the WDT driver from the SAMA5D3/4 to the SAMV7.
      - Add an RSWDT driver.

    * Atmel SAMV7 Boards:

      - SAMV71-XULT:  Add configuration for testing OS modules.

    * Freescale Kinetis:

      - MK60N512VLL100: Add support for the MK60N512VLL100 Kinetis part.
        From Andrew Webster.

    * Freescale Kinetis Boards:

      - ENET:  Numerous updates to the Kinetis ENET driver. That driver is
        now functional. From Andrew Webster.

    * NXP LPC43xx Boards:

      - WaveShare LPC4337-WS:  Support for the WaveShare LPC4337-WS board.
        From Lok Tep.

    * STMicro STM32 Drivers:

      - Timer Capture:  Add timer input capture driver.  From Pierre-Noel
        Bouteville.

    * STMicro STM32 Boards:

      - Olimex STM32 H407:  Added a port to the Olimex STM32 H407 board.
        This board features the STMicro STM32F407ZGT6 (144 pins).
        Contributed by Neil Hancock.

    * TI TMS550 Boards:

      - TI LaunchXL-TMS57004:  Add basic board support for TI LaunchXL-
        TMS57004.  Still a work in progress.

    * C Library/Header Files:

      - sys/time.h: Add timeradd(), timersub(), timerclear(), timerisset(),
        and timercmp() as macros. These are non-POSIX interfaces, but
        included in most BSD deriviatives, including Linux.  From Manuel St??.
      - AVR support: Introduce support for Atmel toolchain in-flash strings.
        Atmel toolchain AVR compiler provides a transparent in-flash object
        support using __flash and __memx symbols. The former indicates to
        compiler that this is a flash-based object.  The later used with
        pointer indicates that the referenced object may reside either in
        flash or in RAM. The compiler automatically makes 32-bit pointer
        with flag indicating whether referenced object is in flash or RAM
        and generates code to access either in run-time. Thus, any function 
        hat accepts __memx object can transparently work with RAM and flash
        objects.
        For platforms with a Harvard architecture and a very small RAM like
        AVR this allows to move all constant strings used in trace messages
        to flash in the instruction address space, releasing resources for
        other things. This change introduces IOBJ and IPTR type qualifiers.
        The 'I' indicates that the object may lie in instruction space on a
        Harvard architecture machine. For platforms that do not have __flash
        and __memx or similar symbols IOBJ and IPTR are empty, making the
        types equivalent to, for example, 'const char' and 'const char*'.
        For Atmel compiler these will become 'const __flash char' and
        'const __memx char*'.  All printf() functions and syslog() functions
        are changed so that the qualifier is used with the format parameter.
        From Dimitry Kloper.
      - debug.h:  Add configuration to support an architecture-specific
        debug.h header file. From Dimitri Kloper.
      - netdb:  Add support for the use of a DNS resolver file like
        /etc/resolv.conf.
      - TEA:  Add an implementation of the Tiny Encryption Algorithm.
      - math32.h:  Add some utilities to support 64-bit arithmetic
        operations for platforms that do not support long long types.

    * Tools:

      - tools/cnvwindeps.c:  Add a tool that will convert paths in
        dependencies generated by a Windows compiler so that they can be
        used with the Cygwin make.
      - tools/mkwindeps.sh: A script that coordinates use of cnvwindeps.exe.
        Dependencies now work on the Cygwin platform when using a Windows 
        ative toolchain.

    * Applications: NSH

      - Module Commands:  Add module commands: insmod, rmmod, and lsmod.
      - Time Command:  Add a 'time' command that may be used to time the
        execution of other commands.
      - Password Commands:  Add useradd, userdel, and passwd commands.
      - MOTD:  Now supports a Message of the Day (MOTD) that will be
        presented after the NSH greeting.
      - Session Logins:  All sessions may be protected with logins using the
        encrypted password in /etc/passwd.
      - Extended Logins.  Added optional platform-specific function to
        perform password verification and optional delay after each failed
        login attempt.

    * Applications: apps/fsutils:

      - apps/fsutils/passwd: Utility library for accessing a password file
        like /etc/passwd.

    * Applications: apps/netutils:

      - apps/netutils/telnetd:  Now creates Telnet sessions by opening a new
        factory device at /dev/telnet and then using ioctl calls to create
        the session character drivers at /dev/telnetN.
      - apps/netutils/netlib:  Add netlib_get_dripv4addr() and
        netlib_get_ipv4netmask().  From Pelle Windestam.

    * Applications: apps/examples:

      - apps/examples/module:  Add a test harness for verifying NuttX kernel
        modules.
      - apps/examples/pca9635:  Add a simple test of PCA9635PW PWM LED driver.
        From Alan Carvalho de Assis.
      - apps/examples/ostest:  Add a test of POSIX timers using SIGEV_THREAD.

Bugfixes.  Only the most critical bugfixes are listed here (see the
ChangeLog for the complete list of bugfixes and for additional, more
detailed bugfix information):

    * Core OS:

      - pthreads: CRITICAL BUGFIX: Logic was wiping out the indication that
        of the type of a pthread.  Hence, it could be confused as a task.
      - waitpid:  CRITICAL BUGFIX.  Add a reference count to prevent waitpid
        from using stale memory released by the waited-for task group.
      - clock_systimespec():  Fix an error in a time conversion.

    * File System/Block Drivers:

      - poll(): Fix handling of sem_tickwait() return value sem_tickwait()
        does not return an -1+errno, it returns a negated errno value.
        Noted by Freddie Chopin.

    * Common Drivers:

      - TUN Driver:  Fix a compile time error in the TUN driver.  From
        Vladimir Komendantskiy.
      - USB Host HID Parser:  Wrong size used in memcpy().  From Hang Xu.
      - PCA9555: Fixed a bug in the function pca9555_setbit which occurs if
        someone tries to set one of the pins 8-15. The problem is that
        after the check if the pin is greater than 7 the variable addr is
        incremented and used in the Call I2C_WRITEREAD. But later in the
        call to the I2C_WRITE buf[0] is used as address but this address is
        not incremented as it should be. Note address does mean the address
        to the register in the ioexpander and not the I2C address.  From
        Stefan Kolb.

    * Networking:

      - TCP/IOB:  Numerous fixes, mostly relate to TCP and IOB buffering
        and race conditions.  These were necessary for for the NuttX
        networking later to be stable in some stress testing.  From Andrew
        Webster.

    * Atmel SAMV7 Drivers:

      - USBHS Device: In USBHS device driver, fix check if zero length
        packet is needed.

    * STMicro STM32 Drivers:

      - OTG FS Host:  Fix some backward arguments to stm32_putreg().  Note
        by Hang Xu.

    * Tools:

      - tools/mkdeps.c:  Extended/fixed support for --winpath option.
        Dependencies now work under Cygwin with a native Windows toolchain.

    * Build System:

      - apps/platform/Makefile:  Use a relative path to the board directory
        link rather than the absolute path.  For Cygwin, the absolute would
        would need converted with cygpath.  But just using the relative path
        is a simpler solution.

NuttX-7.15 Release Notes
------------------------

The 115th release of NuttX, Version 7.15, was made on March 27, 2016,
and is available for download from the Bitbucket.org website.  Note
that release consists of two tarballs:  nuttx-7.15.tar.gz and
apps-7.15.tar.gz.  These are available from:

    https://bitbucket.org/patacongo/nuttx/downloads
    https://bitbucket.org/nuttx/apps/downloads

Both may be needed (see the top-level nuttx/README.txt file for build
information).

Additional new features and extended functionality:

    * Core OS:

      - Add a state variable that provides the current level of OS
        initialization.  This is needed by some logic that may attempt to
        run early in the start-up sequence but cannot run if a sufficient
        level of initialization has not yet occurred.
      - Spinlocks:  Add interface definitions for to support spinlocks as
        needed for multi-CPU configurations.
      - SMP support.  Support for Symmetric Multi-Processing (SMP) added.
        This affects many internal data structures, spinlock extensions
        and renaming of interrupt enable/disable interfaces, new platform
        interfaces to support CPU initialization and inter-actions, and
        new application interfaces to manage CPU affinity.  The changes
        are too extensive to summarize here; see the SMP Wiki page at
        http://www.nuttx.org/doku.php?id=wiki:nxinternal:smp.  The
        new platform interfaces are also described in the NuttX porting
        guide: http://www.nuttx.org/doku.php?id=documentation:portingguide.
        Only partially verified; awaiting hardware for the complete
        verification.
      - TLS:  Basic definitions needed to support thread local storage
        (TLS).  TLS is not used anywhere yet (and may not be used in the
        near future either).
      - Performance Monitoring:  Add a configuration option to buffer
        RTOS instrumentation data in an in-memory buffer.
      - boardctl():  Add boardctl() support that will permit applications
        to control USB devices.

    * File Systems/Block Drivers:

      - procfs:  Add /proc/kmm entry that shows that state of the kernel
        heap.  Only useful in PROTECTED and KERNEL build modes where there
        is a kernel heap.
      - procfs:  Add support for showing CPU in the tast status if SMP is
        enabled.

    * Networking:

      - ARP: Add support for IOCTL commands to manage the ARP table.
      - IEEE 802.15.4 and 6LowPAN:  There are some radio drivers and a
        directory structure is in place.  However, most of this
        development is occurring on a fork and is not yet available in the
        NuttX repositories.  Hopefully in NuttX-7.16.

    * Common Device Drivers:

      - ADS1242:  Driver for the  24-Bit Differential Input ADC ADS1242 that
        communicates via SPI with a MCU. Reading the ADC conversion result
        as well as configuring the ADC, setting the input channel, etc. is
        implemented via ioctl calls.  However, it does not yet implement
        the standard ADC interface.  From Alexander Entinger.
      - U-Blox Modem:  Add an upper half driver for the U-Blox Modem.  From
        Vladimir Komendantskiy. 
      - I2C: Add an I2C, "upper half", character drivers to support raw I2C
        data transfers for test applications.
      - RGB LED: Add a driver to manage a RGB LED via PWM.  From Alan
        Carvalho de Assis.
      - Performance Monitoring:  Add a character driver that will allow an
        application to read buffered scheduler instrumentation data.

    * Simulation Platform:

      - SMP:  Add multi-CPU support to the simulation to support SMP
        investigation.  There are issues with the simulation and it is less
        than perfect but sufficient for some very preliminary testing of
        the core SMP feature.

    * ARMv7-A, ARMv7-R, and ARMv7-M:

      - ARMv7-A, ARMv7-R, and ARMv7-M: Add test-and-set logic and
        definitions needed to supports spinlocks.
      - ARMv7-A: Added MPCOre Generic Interrupt Controller (GICv2) and
        Global Timer support
      - ARMv7-A: Now includes in MCU-specific hooks needed for SMP support.

    * Atmel SAMV7 Drivers:

      - HSMSI: HSMCI driver can now be configured to handle unaligned data
        buffers.

    * NXP Freescale LPC11xx/17xx/43xx and LPC2378 Drivers:

      - I2C: Backported the LPC43XX I2C driver, replacing the LPC11XX,
        LPC17XX, and LPC2378 I2C drivers.  This gives us the I2C_TRANSFER
        method in all I2C drivers.

    * NXP Freescale LPC17xx Boards:

      - Support for the u-blox GSM and GPS module evaluation board with
        NXP LPCExpresso LPC1768.  The GSM module is one of LISA-C200,
        LISA-U200 or SARA-G350. The GPS module is one of MAX-M7 or
        MAX-M8.  From Vladimir Komendantskiy.

    * NXP Freescale i.MX6:

      - Basic support is in place for the i.MX6 Quad/Dual MCUs.
        Verification is, however, waiting for the receipt of hardware.

    * NXP Freescale i.MX6 Boards:

      - Sabre-6Quad:  Basic support for the NXP/Freescale Sabre 6Quad
        board is in place but waiting for hardware for verification.

    * STMicro STM32:

      - STM32F46xx:  Support for STM32F46xx from Paul Alexander Patience
      - STM32L4:  Add support for the STM32L4 family.  From Sebastien
        Lorquet.

    * STMicro STM32 Boards:

      - STM32F4 Discovery: Add PWM support for the onboard RGB LED. From
        Alan Carvalho de Assis.
      - Nucleo-L476:  Add support for the Nucleo-L476 board.  From Sebastien
        Lorquet.
      - STM32L476VG Discovery: Add support for the STM32L476VG Discovery
        board.  From Dave.

    * Tools:

      - tools/refesh.sh now has a --silent option so that it can be used in
        batch modes without human input.

    * Build System:

      - Added a 'make olddefconfig' target that will refresh a .config file
        without interaction.

    * Applications: NSH

      - 'arp':  Add an 'arp' command that will support access to the OS ARP
        table.
      - 'ps':  The 'ps' command will show CPU if SMP is enabled.

    * Applications: apps/netutils:

      - apps/netutils/chat: Chat logic contributed by Vladimir
        Komendantskiy.
      - apps/netutils/netlib:  Add utility functions to support accesses to
        the ARP table.

    * Applications: apps/examples:

      - apps/examples/chat: Chat example contributed by Vladimir
        Komendantskiy.
      - apps/sysem/ubloxmodem:  Example to control the power
        state of the modem in nsh.  From  Vladimir Komendantskiy.
      - apps/examples/leds: An example to demonstrate use of LED driver.
      - apps/examples/smp:  Add a test to verify SMP configurations.
      - apps/examples/rgbled:  Example using the RGB LED driver to drive an
        RGB LED via PWM.  From Alan Carvalho de Assis.
      - apps/examples/ostest:  Add a test of TLS.
      - apps/examples/sched_note:  Add a simple example to exercise the
        scheduler instrumentation logic.

Bugfixes.  Only the most critical bugfixes are listed here (see the
ChangeLog for the complete list of bugfixes and for additional, more
detailed bugfix information):

    * Core OS:

      - Signals:  Move the list of signal actions from the TCB to the group
        structure.  Signal handlers are not per thread but, rather, per task
        group.  I know, I preferred it the other way too, but this is more
        compliant with POSIX.
      - Semaphores: Add an internal, non-standard interface to reset a
        semaphore count.  This is sometimes needed by drivers in order to
        recover from error conditions.  Were previously using sem_init()
        which is both inappropriate and incorrect if the semaphore count is
        negative.
      - Low-Priority Work Queue:  Fix logic to find an IDLE worker thread;
        the test for busy was backward.  From Linfei Chen.

    * File System/Block Drivers:

      - FAT:  Add an option to force all transfers to be performed
        indirectly using the FAT file system's internal sector buffers.
        This is a fix for the case where the user provided buffers are not
        properly aligned for DMA (as with THTTPD).
      - MTD:  Increase block size in mtd_geometry_s to 32-bits.

    * Common Drivers:

      - I2C:  Restructured the I2C interface as necessary to eliminate some
        thread-safety issues inherent in the legacy I2C interface design.
        This effects the interface definition, all I2C clients, and all low-
        level I2C drivers.  I have used caution, but I still expect a change
        of this magnitude to introduce some errors. Any bug reports of bug
        fixes will be much appreciated.
      - I2C_RESET:  Eliminate up_i2creset().  It should not be a global
        function; Now it is an I2C interface method.
      - PCA555:  Add logic to make the PCA555 driver thread safe.
      - syslog: If syslog timestamping is enabled, don't try to get the time
        if the timer hardware has not yet been initialized.
      - AT24xx driver: Correct missing address calculation logic.  From Frank
        Benkert.

    * Networking:

      - Networking drivers that support CONFIG_NET_NOINTS:  Fix a race
        condition that can cause the TX poll timer to stop running.  From
        Manuel Stuhn.
      - Timer Poll:  Fix some logic when there are multiple network
        interfaces.  In this case, TCP timeout events can really only being
        processed when the poll from the correct device is received.

    * Atmel SAMV7 Drivers:

      - SAMV7 USB HS device:  The USB driver has had some issue that would
        occasionally cause loss of packets.  Back last December, a fix was
        put in for this but the fix apparently worsens the problem; now
        causing hangs.  The basic problem is that the number of busy banks
        (NBUSYBKS) status is not real time but is delayed.  This was fixed;
        now when the DMA completes and NBUSYBKS > 0, the NBUSYBK is
        interrupt is enabled and the operations are deferred until NBUSYBKS
        is truly zero.

    * Tools:

      - tools/testbuild.sh:  .config files were not being updated because
        (a) kconfig-conf was being called in the wrong directory and (b)
        apps/Kconfig had not yet been created.  Now uses 'make
        olddefconfig'.

    * Applications: apps/system:

      - apps/system/i2c:  The I2C tool now obeys it OS interfacing: it now
        uses an I2C character driver to access the I2C bus.
      - apps/system/cdcacm, usbmsc, and composite:  Use new boardctl()
        instead of calling directly in the OS when possible.

    * Applications: apps/netutils:

      - apps/netutils/dhcpd: DHCPD no longer calls directly into the OS but
        uses the new network IOCTL commands to modify the ARP table.

    * Applications: apps/modbus:

      - apps/modbus/nuttx/portserial.c:  Was not returning an error on
        failure to open the device driver.  From Olololshka kokoko.

    * Applications: apps/examples:

      - apps/examples/usbserial, composite, usbterm:  Use new boardctl()
        instead of calling directly in the OS when possible.  There are
        still a few bad OS calls for USB device interfaces that do not yet
        have boardctl() commands.

    * Applications: apps/platform:

      - Moved C++ initialization logic out of the RTOS and into the
        application space, specifically to apps/platform/board, where it
        belongs.