ReleaseNotes

      - Fixed an error in the FAT logic that can cause file corruption.  The
        error conditions are rare and only seen with very large files (from
        Andrew Tridgell).  This replaces a previous, partial fix for the same
        problem.
      - Fixed memory leaks in the NXFFS open() and stat() implementations
        (from Lzyy).
      - The interfaces include opendir(), readdir(), et al, were modified so
        that errors will not be reported if you attempt to list a empty
        pseudo-directory.

    * Networking:

      - Fix one place where the connection reference count was not being
        decremented in the socket close() logic.  This is really a cosmetic
        change BUT when CONFIG_DEBUG_NET is enabled, it will cause assertions.
      - Backed out a small part of the NuttX 6.33 write buffering changed.
        David G says that this causes problems in connecting to a server.
      - In DHCPD, there was a place where the logic was calling ntohl()
        inappropriately; the address was already in the correct order.  How
        could DHCPD have worked with this bug?

    * TI Tiva/Stellaris Drivers:

      - Fixed cut'n'paste error that prevented UARTS2-7 from being used with
        the LM4F120 Launchpad.
      - Fixed several errors there were unmasked with UARTs > UART2 are
        enabled (grom Gosha).

    * Allwinner A10 Drivers:

      - Fixed cut'n'paste error that prevented UARTS2-7 from being used with
        the pcDuino.

    * NXP LPC17xx Drivers:

      - Fix an compilation error that crept into the LPC17xx USB host driver.

    * STMicro STM32 Drivers:

      - Fix cloned typo in the serial driver:  FLOWCONTROL vs FLOWCONROL.
      - Disable SPI before changing DPI CR1 register (from David Sidrane).
      - stm32 TIM: Set the timer CCMR when selecting timer channel.  From
        David Sidrane.
      - Fix typo in a Makefile: stm32_pwm.c not stm32_psm.c.  Noted by Max
        Kriegleder.

    * Library:

      - More sscanf()  bug fixes from David Sidrane.

    * Header files:

      - cstdbool:  Ignore _Bool8 if CONFIG_C99_BOOL8=y

    * Configuration/Build System:

      - Several changes to restore the broken native Windows build

    * NuttShell (NSH):

      - Use strncpy vs strcpy in the Telnet console logic to avoid
        overruning the username and password buffers (from Bertold Van den
        Bergh).
      - Add a newline after printing the file in the 'cat' command.  This
        prevents the NSH prompt from be in the same line as the final line
        of the file in the case where there is no newline at the end of the
        file.

NuttX-7.2
---------

The 102nd release of NuttX, Version 7.2, was made on April 29, 2014,
and is available for download from the SourceForge website.  Note
that release consists of two tarballs:  nuttx-7.2.tar.gz and
apps-7.2.tar.gz.  Both may be needed (see the top-level nuttx/README.txt
file for build information).

Additional new features and extended functionality:

    * Core OS:

      - Add support for CLOCK_REALTIME.  From Macs N.

    * Network Utilities:

      - Add a very primitive NTP client.
      - DNS resolver:  Long needed major clean up for coding style and
        unification of naming conventions (resolv vs dns).

    * Common Drivers:

      - Add a new MTD driver that can be used to contain another driver and
        force its apparent sector size to be 512 bytes.
      - If DCD can support queuing of stall requests, then the USB MSC stall
        work around delays are not necessary.
      - Redesign threading module used with the USB MSC driver.  It was using
        pthreads before and these were changed to a kernel thread.  The reason
        for this has to do with task grouping:  A pthread is a memory of the
        group of the task that started it.  A kernel thread is independent of
        the task that started in (other than knowing it as the parent).  This
        allows me to remove so kludge logic to "deparent" the pthread on
        startup.
      - Update the MIO183QT-9A LCD driver to support reading from the LCD.
        From Toby Duckworth.
      - Timer "upper half" driver and l"lower half" interface definition from
        Bob Doiron.

    * Atmel SAM4E/4S Board Support:

      - All SAM4E configurations updated to run with 120MHz CPU speed and
        with the CMCC enabled.
      - Support for the SAM4S Xplained Pro board from Bob Doiron.
      - Add watchdog driver.  From Bob Doiron.

    * Atmel SAM4E/4S Drivers:

      - Add a USB full speed device driver (UDP) for the SAM4E.
      - Add support in HSMCI and SPI drivers to invalidate cached memory if
        the CMCC is enabled.
      - Add logic to handle SPI word widths > 8
      - Port RTC driver from SAMA5 to SAM3/4.  From Bob Doiron.
      - HSMCI:  Extensions from Bob Doiron needed to support PDC-based HSMCI
        DMA transfers.  Verified on the SAM4S Xplained Pro.

    * Atmel SAMA5:

      - Add support for the SAMA5D36 chip.
      - Add functions to calculate PLLACK, PCK, and MCK frequencies given
        the main clock frequency.
      - Implemented RAM functions.  When booting directly into NOR flash,
        reconfiguring the PLL while executing out of NOR FLASH causes
        crashes.  This was fixed by David Sidrane by implementing RAM
        functions. The killer code is copied and executed from ISRAM and
        the crash is avoided.

    * Atmel SAMA5 Drivers:

      - Add support for the SAMA5D3 DBGU.

    * Atmel SAMA5 Board Support:

      - Add a board support configuration for the Atmel SAMA5D3 Xplained
        board running out of SDRAM.  When booting from SDRAM, start-up logic
        needd to query the PMC registers to determine the MCK, PCK, etc.
      - For all SAMA5 boards, added support for 528MHz clocking.

    * TI Tiva/Stellaris:

      - Modify the logic to disables the interrupts and sets the default
        interrupt priority so that it uses the ICTR to get the number of
        interrupt lines/registers.  This is instead of using some fixed
        number of initializations based a priori knowledge of the number
        of interrupt lines in the MCU.

    * STMicro STM32

      - Add support for the STM401RE.  From Frank Bennett.

    * STMicro STM32 Boards:

      - STM32F4Discovery:  Add support to register keyboard and mouse
        classes if so configured.  From Leo.
      - Add support for the Nucleo-F401RE board.  From Frank Bennett.

    * STMicro STM32 Drivers:

      - Add STM32 Ethernet IGMP hashing support.  From Manuel Stühn.
      - OTG FS Host:  USB host tracing added by Leo.

    * Freescale Kinetis

      - Modify the logic to disables the interrupts and sets the default
        interrupt priority so that it uses the ICTR to get the number of
        interrupt lines/registers.  This is instead of using some fixed
        number of initializations based a priori knowledge of the number
        of interrupt lines in the MCU.

    * NXP LPC17xx

      - Modify the logic to disables the interrupts and sets the default
        interrupt priority so that it uses the ICTR to get the number of
        interrupt lines/registers.  This is instead of using some fixed
        number of initializations based a priori knowledge of the number
        of interrupt lines in the MCU.

    * ZiLOG ZNEO Drivers

      - Added ZNEO ESPI driver.

    * Library:

      - Finish incomplete support for ferror().  From Macs N.

    * Documentation:

      - UsbTrace.html:  Add some discussion of the USB monitor.

    * Configuration/Build System:

      - compiler.h:  Add macro UNUSED() that can be used to eliminate
        warnings about variables that are set to values that are not
        used.

    * Debugging Support:

      - Add a configuration option to enable dumping of the USB trace buffer
        on assertion.

    * Applications:

      - IGMP Example:  Fill out Kconfig file; update makefile so that the
        IGMP example can be used as an NSH built-in application. From Manuel
        Stühn.
      - lcdrw Example:  Fill out empty Kconfig file.
      - touchscreen Example:  Add a configuration option to indicate if
        architecture-specific initialized is required, yes or no.
      - System usbmsc:  Back out the USBMSC daemon... it is no longer needed
        with the recent fix to the USBMSC class driver.
      - NSH: malloc/free IOBUFFER for 'cat' and 'hexdump' commands instead of
        using the stack.  From Bob Doiron.
      - cpuhog, serialblaster, and serialrx Examples:  Stress test examples
        added by Bob Doiron.

Bugfixes (see the ChangeLog for details).  Some of these are very important:

    * Core OS:

      - errno_get_errno_ptr() and getpid():  Add some checks.  If these
        functions are called very early in initialization before the tasking
        structures are initialized, they would not behave properly.

    * Networking:

      - IGMP-related bug fixes from Manuel Stühn.
      - In netdev_findbyaddr(), skip network devices that are in the "down"
        state.  It does not make sense to consider an address match with a
        "down" device.  From Brennan Ashton.

    * Network Utilities:

      - DHCPD:  The correct value of the PAD option.  Should be zero, not
        one.  From Brennan Ashton.
      - Corrections to the NTP client from Manuel Stuehn.

    * Common Drivers:

      - usbhost.h:  Fix some USB HID-related conditional compilation.  From Leo.
      - USB HID mouse driver: Don't include NAKs from the device in the error
        count.  From Leo.

    * TI Tiva/Stellaris:

      - Add corrected control logic for TM4C125GXL based on logic from Daniel
        Carvalho with modifications.  The LM4F120 also works well with this
        change.

    * STMicro STM32 Drivers:

      - STM32 F2 SPI:  Correct a mapping for SPI MOSI pin.  From dlsitzer.
      - OTG FS Host:  Fixes related to low-speed devices and interrupt
        endpoints from Leo.  Necessary in order to use a USB HID mouse
        device.
      - STM32 SDIO:  The dmaflight method must be conditioned on
        CONFIG_SDIO_PREFLIGHT.  Noted by Pelle Windestam.
      - Sourceforge Ticket #26.  up_prioritize_irq should not be called
        if CONFIG_ARCH_IRQPRIO is not defined.

    * Atmel SAM3/4:

      - Fix some backward conditional compilation in the start-up logic.
      - Fix initialization of the default interrupt priorities.  This is
        a critical bug fix!
      - SAM4S: Fix error in macros that disable peripheral clocking.  From
        Bob Doiron.

    * Atmel SAMA5:

      - Fix double mapping of SDRAM when executing out of SDRAM.  In this
        case, the SDRAM was already mapping in arm_head.S.
      - In clock configuration, the BMS bit handling was fixed to match
        what the HW really does.  From David Sidrane.
      - TLB Bufferable bit did not do what I thought it was going to do.
        I though I was selecting a write-through cache, but the result was
        that all caching was disabled and NOR FLASH accesses were very slow.
      - Move the un-definitions of __ramfuncs__ from the clock configuration
        .c file to the .h file.  Otherwise, the attribute will be applied
        differently for the prototype and the function definition.
        Sourceforge patch 38 from Luciano Neri.

    * Atmel SAMA5 Drivers:

      - Fix a case in the UDPHS driver where received status was not being
        cleared, causing OUT SETUP commands to fail.
      - TWI data sending fails to increment the number of byes transferred
        on first byte sent.  from David Sidrane.
      - If running from SDRAM, then BOARD_MCK_FREQUENCY is not a constant
        and cannot be used in conditional compilation.  All drivers fixed
        EXCEPT for the PWM and Timer/Counter drivers which will need some
        more extensive redesign.

    * Atmel SAMA5 Boards:

      - SAMA5D3x-EK: The red LED is controlled by PE24 which is also the
        camera/ISI interface reset line.  So if the a camera is installed,
        then we must avoid controlling the red LED or we inadvertently
        also reset the camera module.  Noted by David Sidrane.
      - Header files reference type xcpt_t in certain configurations and
        so must include nuttx/irq.h.  This is Sourceforge bug 25 submitted
        by Luciano Neri.

    * NXP LPC17xx Drivers

      - arm/src/lpc17xx/Kconfig and lpc17_ethernet.c:  The default interrupt
         priority should be default, not the highest priority (2014-4-19).

    * ZiLOG ZNEO

      - Fix calculation of timer reload and prescaler.  The timer frequency
        was way too fast.

    * Library:

      - strncpy():  Change ordering of test and copy.  Logic would have
        failed if n=0; one byte was always copying before testing
        for the end of the copy.
      - Fix a counting error in the return value from sscanf().  Noted by
        kfrolov.  Also, sscanf() should return EOF if no values were
        converted.
      - Fix a logic error in ftell().  It was simply using the file offset
        and did not take into account data buffered in memory.  From Macs N.
      - sccanf():  Use stroul() vs strol() with %u format otherwise, range
        of values is restricted because of sign bit. From kfrolov.

    * Configuration/Build System:

      - Fix a build error that occurs when only USB device tracing is enabled.

    * NuttShell (NSH):

      - Fix NuttShell version number display in the NSH welcome message.
        version.h was not being included.

    * Other Applications:

      - sysinfo:  CONFIG_VERSION_BUILD is a string an needs to be
        printed with %s, not %d.  Noted by Librae.
      - nxplayer:  Compilation failure in one configuration reported by
        Manuel Stuhn.
      - System sdcard:  Remove an STM32 dependency.  From Bob Doiron.
      - telnetd Example:  Naming is confused.  In someplaces 'telnetd',
        and in others 'shell.'  All changes to telnetd.  Noted by Pelle
        Windestam.

NuttX-7.3
---------

The 103rd release of NuttX, Version 7.3, was made on June 25, 2014,
and is available for download from the SourceForge website.  Note
that release consists of two tarballs:  nuttx-7.3.tar.gz and
apps-7.3.tar.gz.  Both may be needed (see the top-level nuttx/README.txt
file for build information).

Additional new features and extended functionality:

    * Core OS:

      - Dynamic loader: Framework to support Pascal P-Code as a binary
        format that can be exec'ed from a file system.
      - Dynamic Loader:  Extend the binfmt interface to handle error
        conditions where format-specific clean-up is needed in the event
        of error conditions.  This is needed by the P-Code binfmt.

    * Networking

      - IOB:  Add a generic I/O buffer chain logic.  This logic uses small,
        pre-allocated buffers that can be chained together to support
        transfers of any size, using fewer resources and also without
        committing in advance to a TCP window size.  There is now only
        one I/O type used in the networking and it is these I/O buffer
        chains.
      - TCP Write Buffering:  TCP write buffering logic converted to use
        I/O buffer chains.
      - TCP Read-Ahead Buffering:  TCP read-ahead buffering logic converted
        to use I/O buffer chains.
      - Includes logic to support throttling of read-ahead buffering if
        the read-ahead buffering is competing with write buffering for
        I/O buffers.
      - Raw Sockets:  Add support for the AF_PACKET socket family.  From
        Daniel Lazlo Sitzer.

    * Common Drivers:

      - W25 Serial FLASH driver extended by Mark Whitehorn to support the
        8Mbit W25Q80BV part.
      - Add support for Fujitsu MB85RS1MT RAMTRON part.  From Charles Ash.
      - Enhancements to the generic timer interface to support capture mode
        from Bob Doiron.
      - Add an rxflowcontrol method to the serial interface to better
        support RX flow control. This involves common changes in addition to minor updates to all MCU-specific serial drivers (only fully implemented for the STM32). From Jussi Kivilinna.

    * Atmel SAM4C

      - Add support for the SAM4CM family.  From Max Neklyudov.

    * Atmel SAM4E/4S Drivers:

      - RTT driver from Bob Doiron.  Also added high resolution RTC
        emulation using the RTT for the sub-second counter.

    * Atmel SAM4E/4S Board Support:

      - The SAM4S Xplained Pro now uses the extended timer/counter
        features. From Bob Doiron.
      - Added a touchscreen and LCD driver for the SAM4E-EK board (the LCD,
        however, not yet fully functional).

    * Atmel SAMA5:

      - Optimized, high performance, assembly language memcpy().  This is
        the same optimized memcpy() function that Mike Smith brought in
        for the ARMv7-M with minor tweaks by David Sidrane to work with
        the ARMv7-A.
      - Basic support added for the SAMA5D4 family.

    * Atmel SAMA5 Drivers:

      - SAMA5D4:  New drivers unique to the SAMA5D4: XDMAC, SAIC, and
        others.

    * Atmel SAMA5 Board Support:

      - SAMA5D4-MB:  Initial board support for the SAMA5D4-MB/EK boards.

    * STMicro STM32

      - Add support for the STM32152 and STM32162 Medium+ density parts
        (plus miscellaneous other improvements to the original STM32151
        logic).  From Jussi Kivilinna and Sami Pelkonen.

    * STMicro STM32 Boards:

      - Support for the Olimex STM32 H405 board contributed by Martin
        Lederhilger.

    * STMicro STM32 Drivers:

      - Implement the rxflowcontrol method to the serial interface to better
        support RX flow control. From Jussi Kivilinna.

    * NXP LPC17xx Drivers:

      - Added support for the RTC, ADC, DAC, Timers, PWM and MCPWM
        drivers.  From Max (himax).

    * NXP LPC17xx Boards:

      - Support for the RTC, ADC, DAC, Timers, PWM and MCPWM integrated
        in the LPCXpresso LPC1768 board support.  From Max (himax).

    * Library:

      - Add support for seek-able streams.

    * Configuration/Build System:

      - Restructured network directories, header files, and naming to
        better modularize the networking and to better integrate the
        networking with the rest of NuttX.

    * Applications:

      - prun:  An NSH built-in application that can be used to run
        Pascal P-Code programs either programatically or from the NSH
        command line.
      - netpkt:  A "raw" socket test from Lazlo Sitzer.
      - hex2bin:  A library and built-in task to convert from
        Intel HEX to binary format.  It can write the binary data to a file or it can store the binary data to memory (to support, for example, a loader).

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:

      - Dynamic Loader: Fix an error in a symbol table search function.
        Noted by Pelle Windestam.
      - Dynamic Loader:  Fix a critical error in exec(); argv was not
        being passed.
      - mq_notify:  Test for a valid signal number was inverted; this
        function could not have been working correctly before???  From
        eero.nurkkala.
      - Fix typo in conditional compilation:  CONFIG_CLOCK_MONOTONIC vs.
        CLOCK_MONOTONIC.  From Manuel Stühn.

    * Graphics

      - Fix typos in several RGB conversion macros.

    * Networking:

      - Modify TCP timout handling to provent situations where connections
        may not be freed. From Max Holtzberg.
      - Improved TCP fallback allocation logic from Max Holtzberg. Also,
        fallback mechanism is disabled when SO_LINGER is to prevent
        deadlocks.
      - Write Buffering:  Add checks from buffer allocation failures. From
        Max/Himax.

    * Network Utilities:

      - webserver: httpd_fs_open() should return OK on success and ERROR on
        failure, not 1 and 0.

    * Common Drivers:

      - Make sure that all references to up_prioritize_irq() are
        conditioned on CONFIG_ARCH_IRQPRIO.  Problem noted by Mike Smith.
      - CC3000: Correct SPI mode for CC3000 is CPOL=0 CHPA=1. From Jussi
        Kivilinna.
      - CC3000: Fix a race condition in thread start-up logic. From Jussi
        Kivilinna.
      - CC3000: Additional fixes including a compilation failure if POLL is
        enabled. From Jussi Kivilinna.

    * USB Drivers:

      - CDC/ACM and PL2303 device:  Reset RX head to avoid resending last
        serial data when USB cable disconnected/re-connected.  From
        Lizhuoyi.

    * TI Tiva/Stellaris Boards:

      - The Nucleo-F401RE has no on-board crystals and, hence, needs to run
        with the PLL input from the on-chip HSI clock.

    * STMicro STM32 Drivers:

      - Serial:  Handle configuration for the case of 8-bit data with
        parity.  From Freddie Chopin.

    * Atmel SAM3/4 Boards:

      - There was a cloned error in all SAM3/4 board configurations (and
        for a few other architectures as well).  Button interrupts not
        being disabled after being detached.  As a result, unexpected
        interrupts could be received after the button interrupt was
        detached.

    * Atmel SAMA5:

      - Fix some critical typos in the SAMA5D3 DMA definitions.

    * STMicro STM32 Drivers

      - I2C: Add an alternative I2C implementation for the STM32 F103 that
        works around errata in that specific part.  From Patrizio Simona.
      - RTCC:  Add retry logic to RTC initialization. It sometimes takes
        longer for the RTC to initialize, at least as noted on an F2 part.
        From Daniel Lazlo Sitzer.

    * NXP LPC17xx Drivers

      - GPDMA:  Fix an error when DMA is started:  The read-modify-write
        fails when the DMA is started.  This is because the value read is
        not the same as the value set (on write it is the number of
        transfers to do; on read it is the number of transfers completed).
        From Lizhuoyi.

    * Library:

      - snprintf():  If the size passed to snprintf() is zero, then
        snprintf() must write nothing, but instead return the size of the
        buffer needed to hold the entire string.  From Sami Pelkonen.

    * Configuration/Build System:

      - The alternate console device CONFIG_NSH_CONDEV must not be defined
        unconditionally. This causes errors when using Telnet sessions.
        This was solved by adding CONFIG_NSH_ALTCONDEV: CONFIG_NSH_ALTCONDEV enables or disables the feature then, if
        enabled, CONFIG_NSH_CONDEV provides the alternative console
        device name.
      - Many files: Convert all old-style GCC variadic macros to the C99
        form.  Recent GCC changes tightens up that behavior and can cause
        some problems (at least for the IAR compiler for some reason).
        Noted by Bob Grimes.
      - tools/configure.sh:  In-place SED edit messes up permissions on
        windows. From Hannes Delago.

    * Build Tools:

      - tools/mkfsdata.pl:  Apparently, the trailing the 0x00 in http
        server files is seen as a bug in javascript and images.  From
        Max/Himax.

    * Other Applications:

      - I2C Tool:  Fix to show the updated register address on each
        fetch (vs. showing the same starting address each time).  From
        Ryan VanSickle.
      - CLE was not returning the terminating newline character. But
        reported by Max kriegleder.

NuttX-7.4
---------

The 104th release of NuttX, Version 7.4, was made on August 15, 2014,
and is available for download from the SourceForge website.  Note
that release consists of two tarballs:  nuttx-7.4.tar.gz and
apps-7.4.tar.gz.  Both may be needed (see the top-level nuttx/README.txt
file for build information).

Additional new features and extended functionality:

    * Core OS:

      - Beginnings of a crypto/ subsystem from Max Neklyudov
      - Tickless operation:  NuttX now supports a mode with no periodic
        timer interrupts.  Rather, timed events are handle via an interval
        timer.  This (1) lowers the rate of interrupt processing to timer
        events, (2) gives much high timing resolution, and (3) allows lower
        power modes of operation where the CPU is not constantly being
        interrupted by the timer.
      - Restructured the OS files under sched/ to better support the already
        modular nature of the RTOS.

    * Networking

      - Substantial directory and header file reorganization and renaming to
        make the NuttX networking implementation more modular.
      - Add network device ioctl to access PHY registers. From Daniel Lazlo
        Sitzer

    * Binary Loader:

      - Various changes associated with symbol tables from Pelle Windestam.

    * Graphics:

      - colorcmp(): New utility to compare two colors.
      - The initial background color is now configurable.  Includes logic to
        eliminates multiple background updates to get the right color.
      - Minor configuration changes to handle mouse X/Y and touchscreen
        X/Y differently.

    * File System/Block Drivers:

      - SmartFS: Increase some variables from uint16_t to uint32_t to handle
        larger device sizes.  From Ken Pettit.
      - Add configurable AES encryption support to the block-to-character
        (BCH) driver.  This allows any block device to be accessed as an
        encrypted character device.  From  Max Nekludov
      - Add an MTD layer that will add read-ahead or write buffering to any
        MTD driver (incomplete).
      - Automounter:  Add support for an auto-mounter that will automatically
        mount and unmount a file system a media is inserted and removed

    * Audio/Audio Drivers

      - WM8904 audio CODEC driver.
      - PCM .WAV file decoder. Fast forward implemented with sub-sampling
        (currently no rewind support).
      - Add a NULL audio device that can be used to simply unit-level testing
        of audio decoders.
      - Audio subsystem now supports interfaces for fast-forward and rewind
        needed by CMediaPlayer; add hooks for equalizer settings needed by
        the WM8904 CODEC.

    * Other Common Drivers:

      - MTD: Extend erase block size to 18-bits in order (decrease block
        size to 14-bits) to handle parts with large erase blocks. From Kosma
        Moczek
      - maxTouch:  Add support for the Atmel maXTouch touchscreen controller.

    * Host Simulation:

      - Provides the timers needed to support the Tickless mode of operation.

    * Atmel SAM4C:

      - Add SAM4CM IPC register header file.  From Max Neklyudov
      - Various fixes PMC and clock configuration for the SAM4CM port from
        Max Neklyudov

    * Atmel SAM4E/4S Drivers:

      - SAM4 AES driver.  Contributed by Max Neklyudov

    * Atmel SAMA5:

      - Add logic to redirect all SAMA5D4 interrupts to the AIC
      - Add a configuration option to reserve DRAM for a framebuffer when
        executing out of DRAM.  This optional was available before when
        executing out of NOR, but needs to work a little differently in
        this case.
      - Add SAMA5 slow (32.768KHz) clock support.
      - Add support for the ARM L2CC-PL310 L2 cache.  The system runs with
        L2CC cache enabled but there is some issues still with the LCD DMA;
        I suspect that the memory timing configuration for L2CC needs to
        be tuned.
      - Provides the timers needed to support the Tickless mode of operation.

    * Atmel SAMA5 Drivers:

      - XDMAC-based HSCMI driver for the SAMA5D4
      - Adapt the SAMA5D3 LCDC driver to work with the SAMA5D4 which has
        no hardware cursor.
      - PIO: Add a new interface sam_pio_forceclk() that can be used to
        force PIO clocking on.  I am afraid I was too conservative with
        PIO clocking in the initial design; this is the price.
      - TWI:  Now supports the up_i2creset() method.
      - TWI:  Use sam_pio_forceclk() so that we can read the current state
        of an open-drain output in the TWI reset logic.
      - SSC:  SCC Frame Synch Delay and Start Delay are now configurable.
      - PCK:  Add the slow clock and the main clocks as options for the
        PCK configuration.
      - Timer/Counter: Can now handle non-constant BOARD_MCK_FREQUENCY. Also
        now supports methods to attach client interrupt handlers
      - One shot and free-running timers.  These are wrappers around the low
        level timer/counter logic to provide one-shot and free-running
        timers.  These were developed to support the Tickless operation, but
        can be used for any purpose.

    * Atmel SAMA5 Board Support:

      - Add a boot loader that runs from ISRAM and loads an Intel HEX file
        into DRAM.
      - Add a configuration that will load a bootloader into AT25 Serial
        FLASH
      - SAMA5D4-EK NSH configuration supports many more features: RTC, HSCMI
        card detection, maXTouch touchscreen, TM7000 LCD, the command line
        media player (currently using the NULL audio device), automounter,
        and others.
      - SAMA5D4-EK:  Add an NxWM configuration using the TM7000 LCD with
        the maXTouch multi-touch touchscreen.
      - SAMA5D4-EK NxWM: Uses new, larger icons in configuration instead of
        scaling.
      - SAMA5D4-EK NxWM: The NxPlayer and audio system are now enabled in
        the default configuration (but currently using the NULL audio
        device).  The automounter is used to automatically mount media
        on an SD card.
      - SAMA5D3x-EK:  Add a configuration to support the command line
        NxPlayer and to verify the WM8904 CODEC driver.

    * STMicro STM32:

      -  Add support for the STM32F103RC and RD.  From Kosma Moczek
      -  Add a procfs entry to show the state of the CCM heap usage.
         From Pelle Winderstam 

    * STMicro STM32 Drivers:

      - Unconfigure GPIO pins when closing a serial port to prevent back
        effects from back-powering on the TX pin. From Kosma Moczek

    * NXP LPC17xx Drivers:

      - ADC:  Added burstmode ADC conversion mode, with CONFIG_ADC_BURSTMODE
        option in Kconfig.  From Max
      - Ethernet: Added option to use the kernel worker thread to do most of
        the workload with CONFIG_NET_WORKER_THREAD option in Kconfig.  From Max
      - Ethernet: Critical bugfix: From time to time (after some hours) the
        Ethernet receiver would lose one receive interrupt and the IP stack
        never recover because there is no receive watchdog as the transmit
        watchdog.  From Max

    * NXP LPC17xx Boards:

      - mbed: Port ADC, DAC, and PWM logic from the configs/zkit-arm-1769.
        From Max
      - mbed:  Eliminated a problem with PHY DP83848C : it doesn't need a
        specific initialization on mbed.  From Max

    * Library:

      - Adds support for localtime.  From Max Neklyudov

    * Configuration/Build System:

      - Make variable definitions 'static const' when possible to save RAM
        usage.  From Kosma Moczek

    * Applications:

      - sysem/mdio:  New PHY tool from Daniel Lazlo Sizter.
      - NSH:  Networking logic modified to handler the case of SLIP
        transport.  From Max Neklyudov.
      - NSH:  Add a configuration to use a USB keyboard for the stdin
        device.
      - NSH:  Software assigned MAC address is now configurable. From Lazlo.
      - NSH:  Also add an option to let platform-specific logic select the
        MAC address.
      - NSH:  There is now a configuration option that will bring up the
        network on an separate thread.  Since the network bring-up is
        asynchronous, there are no serial console start-up delays due
        to the network negotiation time.
      - NxPlayer: Changes to integrate with Ken's NxWM::CMediaPlayer.
      - NxPlayer: Add interfaces for fast-forward and rewind needed by
        CMediaPlayer; add interface for equalizer settings needed by the
        WM8904.
      - NxPlayer:  Supports new way of identifying the end of the audio
        stream (see the Audio section above).
      - Sudoku:  Add a sudoku game.

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):

    * Graphics:

      - NxConsole: Fix scrolling for the case of the framebuffer device.  In
        this case, the logic for clearing the vacated region at the bottom
        was missing so garbage would scroll up from the last, uncleared
        line.

    * Networking:

      - Important fix to the read-ahead buffer queue management: Consumed
        bytes were being trimmed from the head of the queue, but the queue
        head itself was not being updated.  From Rony XLN.
      - Fix an error in SLIP escaping.  From Max Neklyudov

    * Network Utilities:

      - Fix an include file ordering problem when CONFIG_NET_STATISTICS=y.
      - Move statistics from uip.h to new netstats.h  to remove a circular
        inclusion problem
      - Various fixes for networking and tiny webserver from Max
      - webclient:  Fix to offset calculation from Rony Xln.  Prevents 0x0a
        at the beginning of lines.
      - webserver:  Fix some configuration usage issues.  From Max.
      - webserver:  Missing logic to close sockets on loop termination.

    * File System / Block Drivers:

      - SmartFS:  Fix for a bug that would show up if CONFIG_MTD_BYTE_WRITE
        was not selected and the SMART sector size was larger than the MTD
        device's block size (like it would be if using SMARTFS on larger
        flash devices).  From Ken Pettit.

    * Audio:

      - Change how the end of the audio stream is detected by the leaf audio
        component.  This used to be done by looking for the first partial
        buffer.  That does not work with the in-place sub-sampling performed
        by the PCM decoder:  That always reduces the size of the buffer so
        that all buffers only partially filled by the time they get to the
        leaf.  Now, a flag is set in the audio buffer flags set to indicate
        the final buffer in the stream.

    * Common Drivers:

      - RAMLOG putc() method needs to set the errno and return EOF on a
        failure.
      - Add missing configuration option to select the MAX11802 touchscreen
        controller. From Petteri Aimonen

    * Atmel SAMA5D3/4:

      - Fix logic in conversion of physical and virtual DRAM addresses when
        running out of DRAM.  This is an important bug fix for the SAMA5D3
        and 4 when running out of DRAM .
      - Critical SAMA5D3 and 4 bug fix:  PIO clocking must be enabled for
        all input pins or else the value that is read never changes.

    * Atmel SAMA5D3/4 Drivers:

      - OHCI: Fix an error in a DEBUGASSERT statement.  Caused an
        assertion to fire inappropriately when a low- or full-speed device
        was removed and CONFIG_DEBUG=y
      - OHCI: Pointers to allocated port values were not being
        nullified after being deallocated.  This caused some assertions
        to fire when debug was enabled
      - SSC:  Needs to account for data offset in audio buffer

    * ARMv7-M:

      - Correct the initial value of the BASEPRI register.  This was
        apparently never being initialized! From Max

    * STMicro STM32 Drivers:

      - I2C:  Fix missing configuration of GPIO pins in I2C driver.  Fix
        from Alex D.
      - STM32 OTGFS device:  Various changes to try to reduce that amount of
        time in interrupts handles and with interrupts disabled.  From
        Petteri Aimonen

    * Atmel SAM3/4 Drivers:

      - Ethernet: Wrong bits being cleared before OR-ing in new settings.
      - Ethernet: Fix an error in the function that determines the number
        of free TX descriptors.  This is an important bugfix on busy
        networks.
      - I2C: Test for read or write operation was reversed.  How could
        this have worked before?

    * Atmel SAM3/4 Boards:

      - SAM4S Xplained-Pro:  Correct description of LEDs and usage. From
        Kosma Moczek

    * Atmel SAMA5:

      - PIO: Fix definitions that could disable PIO interrupt support if only
        PIOE interrupts were enabled
      - PIO: Macro SAM_PION_VBASE is not define-able for the SAMA5D4 and must
        be replaced with a table lookup.
      - PIO: Fix a typo in Schmitt trigger configuration; Configure pin as a
        vanilla input first so that final pin configuration is more read-able
        (i.e., easier to debug)
      - PIO: Logic for Schmitt trigger selection backward
      - SAMA5D4:  Correct system timer frequency.  Input clock is MCK/2, not MCK.

    * Atmel SAMA5 Drivers:

      - Ethernet: Wrong bits being cleared before OR-ing in new settings.
      - Ethernet: Fix an error in the function that determines the number
        of free TX descriptors.  This is an important bugfix on busy
        networks.
      - HSMCI: The 8-byte SCR transfer was failing silently with the DMA
        transfer, leaving the SD card in single bit mode.  Fixed by adding
        a non-DMA read transfer mode.
      - HSMCI: Fix a problem on card insertion/removal callback handling.
        Interrupts were being disable so that the callbacks occurred with
        interrupts disabled.  This resulted in loss of some interrupts and
        some not-so-good behaviors.  The solution is to perform all
        callbacks on the work thread unconditionally

    * Atmel SAMA5 Boards:

      - PIO: Fix some cloned errors in SAM GPIO interrupt setup

    * NXP LPC17xx Drivers:

      - Ethernet:  Comment out an assertion that is reported to fire
        inappropriately.  From Max

    * Library:

      - stdint.h: Correct naming of [U]INT_LEASTn_{MAX|MIN} and
        [U]INT_FASTn{MAX|MIN}. From Kosma Moczek
      - unistd.h: POSIX definitions should be defined to a value. rom Kosma
        Moczek
      - Fixes associated with rint() and related interfaces in the math
        library.

    * Configuration/Build System:

      - NAME_MAX not available on SunOS; use FILENAME_MAX or MAXNAMELEN.
        Noted by Douglas Beattie

    * Applications:

      - NSH: if # appears on line, need to comment ignore additional
        commands on the line
      - NxPlayer:  Check for file read errors and end-of-file with zero
        bytes read.  Other error handling corrected as well.
      - NxPlayer:  NxPlayer needs to set curbyte field to zero before
        enqueuing a buffer.  Otherwise, it looks like beginning of the
        buffer has already been consumed.