What's New In This Release

Highlights

Better separation between kernel and userspace.
Heap and stack management improvements.
More closely follow POSIX and Linux interfaces.
Symmetric Multi-Processing (SMP) performance improvements and bug fixes.
Networking improvements and bug fixes.
Added support for many microcontrollers and boards, and improved support for many existing ones.
Many added and improved drivers.
Build system improvements to deliver faster builds.
Thousands of NuttX files converted to Apache 2.0 License with permission of their authors.
Improved listing of 3rd party licenses used in NuttX (see LICENSE, NOTICE, and DISCLAIMER-WIP files).

Major Changes to Core OS

New Features

#2324 audio: libsamplerate: add initial audio Sample Rate Converter
#2820 arch, boards, drivers, include, sched, wireless: Change spinlock APIs.
#2885 Ensure the kernel component don't call userspace API

Bug Fixes

#1852 sysconf: add _SC_PAGESIZE sysconf support
#1922 sched: nxtask_start should call entry point directly for kernel thread
#1994 libc: Don't fclose and fopen file in freopen
#2005 Fix note_syscall_leave_s to avoid unaligned access
#2043 sched: Add SCHED_INSTRUMENTATION_HIRES support
#2044 sched: Add note_syscall args support
#2071 pollnotify: we should send poll events before semaphore incrementes.
#2076 libc: math: Make this friendly with libcxx
#2111 LIBCXX related fixes
#2147 sched: Use nx_close() inside OS
#2176 syscall/syscall.csv: Increase number of arguments for prctl()
#2204 sched: irq: Fix enter_critical_section() in an irq handler for SMP
#2218 sched: signal.h: fix compile failed when open TTY_SIGINT
#2229 sched/sched/sched_waitid.c: Allow WNOHANG
#2236 sched/task/task_exithook.c: Remove a redundant assignment
#2243 libcxx: Update 0001-libcxx-Port-to-NuttX-https-nuttx.apache.org-RTOS.patch
#2255 sys/epoll: sync the epoll define with linux
#2256 unistd/sched_sporadic: correct the disable value
#2261 sched/timer: add support of CLOCK_MONOTONIC
#2262 sched/init: init the default home directory to environment
#2285 libc/stdlib: Fix range check in strtoul(l)
#2326 libc: Enhance getopt function
#2407 libc: machine: arch: Support armv8-m relocation
#2418 libc: Change OK/ERROR from macro to enum
#2420 sched/signal: Remove redundant checks
#2437 sched/sched/sched_waitpid.c: Fix return value
#2449 mm/circbuf: fix the problem of dividing by zero
#2450 unistd/getopt: remove number of arguments limit
#2451 libc: pthread_mutexattr_getprotocol: modify prototype
#2455 sched/sched/sched_waitpid.c: Discard the correct child entry
#2475 sched/sched_waitid.c: Fix two bugs when CONFIG_SCHED_CHILD_STATUS is enabled
#2487 sched: clock/time: add CLOCK_BOOTTIME definition
#2492 procfs: make array const to reduce memory use
#2494 sched: Fix SMP
#2509 libc: net: implement ether_aton/ether_aton_r
#2517 sched: spinlock: Introduce SP_WFE() and SP_SEV()
#2518 sched: Don't forward gettid to getpid directly
#2530 libc: Implement posix_fallocate
#2533 sched: Make the number of queue/signal used by irq handler configurable
#2534 libc: Implement getppid
#2538 sched: pthread: Fix potential bugs in pthread_condclockwait.c
#2574 libc: dumpbuffer: dump buffer enhancement
#2580 sched: arch & sched: task: Fix up_exit() and nxtask_exit() for SMP
#2585 libc: netdb: Move hostbuffer out of the stack
#2602 sched: Add include/sys/poll.h
#2604 libc: Add b64_ntop and b64_pton implementation
#2616 libc/dumpvbuffer: update the vector ptr correctly
#2624 sched: implement the default test-and-set semantics
#2627 OS internal function should indicate the error by return negative value
#2630 libc: net: implement socketpair
#2631 sched: mqueue: simplify the mqueue reailize
#2650 libc: ctype/iscntrl: correct the control character function
#2653 sched: Don't call sched_lock()/unlock() in nx_waitid()/waitpid() for SMP
#2668 Kernel module should prefer functions with nx/kmm prefix
#2675 libc: Add placement new and new[] function
#2693 libxx: use built-in __aeabi_atexit() if LIBSUPCXX is enabled
#2694 libc/machine/arch: fix build break if enable armv8 ELF
#2719 sched/task: setup the scheduling policy to task
#2726 sched: sched: Remove sched_lock/unlock from nxsched_set_affinity()
#2737 sched: task: Fix a potential bug in nxtask_assign_pid()
#2740 sched/timer: get the previous reload value correctly
#2741 libc: unistd/fpathconf: enhance fpathconf
#2742 libc: pthread/cond: enhance pthread_cond_destroy
#2744 sched: task: Fix comments and label in nxtask_assign_pid()
#2765 sched: pthread: Return get_errno instead the hardcode value
#2767 sched/wqueue/notifier: protect the work notifier with critical section
#2797 sched: group: Fix group_kill_children() for SMP
#2849 mqueue: Add _MQ_OPEN, _MQ_CLOSE and _MQ_UNLINK macro
#2855 libs: Remove the duplicated NX and MQ macro
#2865 libc: :machine:risc-v:unifying elf relocation code
#2872 sched: pthread: Fix pthread cmdline issue
#2881 libc: Move stack check stuff from libc/stdlib/ to libc/assert/
#2904 libc: unistd/getcwd: enhance getcwd when buf is NULL
#2906 mm: umm_heap: valloc: support valloc (LEGACY)
#2910 libc/hex2bin: fix handling of segment offsets
#2919 sched: fix fd leak in dlopen
#2938 libs: misc: Remove critical section in lib_filesem.c for SMP
#2942 mtd: progmem: Add up_progmem_read callback guarded by ARCH_HAVE_PROGMEM_READ
#2946 sched: task: Call nxtask_flushstreams() without critical section
#2960 sched: signal: sigdeliver: fix system block when kill signal to idle in SMP
#2980 include: Add iso646.h for alternative spellings
#2981 sched: Remove all group id related stuff
#3033 unistd: Fix getpriority not handling invalid input value
#3080 sched: semaphore: Remove a redundant critical section in nxsem
#3083 libc: stdio/lib_clearerr: Did not clear stream buffer flags in clearerr
#3086 mm: improve the memory manager modularity and reduce the information explosion
#3111 sched: Sporadic scheduler: Fix time calculation and compile errors when assertions are enabled:
#3115 libc: time: localtime: fix race condition
#3121 mm/heap: Move semaphore related declaration to private header
#3123 sched: pthread: Remove a redundant critical section in pthread_condclockwait.c
#3131 mm: Minor fix for heap manager
#3159 mm: mm_heap: Remove critical section in mm_sem.c
#3170 libc: Move getopt() variables into TLS
#3196 sched/signal: Implement SA_NODEFER
#3228 mm/mm_heap: fix compile failed when open DEBUG_MM
#3244 libdsp: Improvements for libdsp and support for fixed16 libdsp implementation
#3247 sched: Move the default Task Stack size to Stack menu
#3251 libc: update pthread_once according to the specification
#3253 libc pthread: Fix pthread_rwlock_init return error
#3268 libdsp/fixed16: add open-loop handler
#3272 libc: Implement getopt_long() and getopt_long_only()
#3280 libc: Correct some getopt() logic
#3289 sched: task: Fix to initialize the task-specific data
#3294 libc: getopt(): Fix Use of Pointer before NULL check
#3299 libc: getopt_common(): Correct handling of unsupported long options.
#3308 libc: getopt_long(): Add support for required argument format
#3445 libc: update stream getoffset to handle write case
#3447 libc: correct zoneinfo genromfs source directory

Major Changes to the Build System

New Features

#1834 License/authorship handling scripts
#2107 build: Makefile should reference CONFIG_HOST_xxx
#2392 configure.sh: support custom board build config with absolute path
#2824 build/esp32: Create Flash size configuration and a new DOWNLOAD make target
#3317 tols: Update python scripts to py3 and lint all of them againt Black

Bug Fixes

#1890 make/expression: improving up asm/C/C++ compile times(make with multi-jobs only)
#1940 cygwin build - path issue fix for Renesas arch
#2032 build: Change .external_dummy to dummy
#2101 build: Add $(OBJS) and $(BIN) to CLEAN macro to clean objects also in subdirectories
#2192 build: Move NuttX definition to tools/Config.mk
#2221 tools: Avoid messing the final binary nuttx.(bin,hex,...) compilation msg
#2335 build: Parallelize depend file generation
#2380 tools: Fix nuttx-gdbinit for armv7-m with FPU
#2404 Update checkrelease script to check readme.md instead of .txt
#2411 tools: Add 'handle SIGUSR1' to nuttx-gdbinit for the NuttX sim SMP
#2432 build system: add missing --obj-path to MKDEP
#2557 tools/version.sh: Fix the version retrieved from GIT
#2561 tools: Fix version.sh
#2642 tools/version.sh: Fix the version retrieved from git-tag
#2673 tools: esp32: add a gdb script to show backtrace
#2679 tools: esp32: btdecode.sh: Script to decode the Xtensa backtrace.
#2701 tools: gdbinit: add support for reporting total and used stack size
#2729 tools: esp32: backtrace.gdbscript: Add comments
#2803 tools: esp32: Remove some duplicated output
#2882 tools: esp32: refine the QEMU image generation.
#2895 tools: esp32: fix warnings from ShellCheck
#2930 tools: version.sh: If the version is not available, use 0.0.0
#2982 tools: nxstyle: Verify relative path in the file header
#3004 tools: esp32XX: Delete the Makefile that downloads IDF.
#3012 tools: esp32xx: Few fixes/improvements to the post build scripts
#3017 tools: esp32: Config.mk: Revert part of "Don't abort make when QEMU script fails"
#3094 tools: version.sh: Fix PATCH including extra version

Architectural Support

New Architecture

#1995 arch: Add custom arch chip build support
#2161 Added Support for more TI Tiva Microcontrollers: TM4C123GH6PZ, TM4C123GH6PGE, TM4C129ENCPDT, and TM4C129ENCZAD.
#2566 arch/risc-v: Add BL602 support
#2974 STM32L5 Architecture Support
#3001 arch:riscv64:basic porting for C906
#3023 Remove nr5m100 and gap8 support

Architectures with significant improvements

ARM

#2042 Fix interrupt stack handlings for ARM SMP
#2061 Refactor arm interrupt stack related code
#2309 Fix armv7-a L2CC and apply the code to the sabre-6quad board
#2876 arm: ARMv6-M vector table offset register support
#2932 arch: armv6-m: Apply armv7-m signal handling logic
#2944 armv8-m: Fix EXC_RETURN for non-secure usage
#2990 arch/armv7-m: Adds dwt helper functions for controlling watchpoints i…

CXD56XX

#2750 arch: cxd56xx: Add i2c bitbang lower driver
#2830 Driver-specific spinlock for cxd56_serial.c

STM32

#2010 arch/arm/src/stm32h7/stm32_spi.c: fixed build issue when SPI is configured
#2095 arch: stm32: fix otghs logic to support interface requests
#2177 FLASH waiting cycles are configured based on HCLK.
#2180 stm32 - Add register mappings for STM32G474 VREFBUF
#2194 stm32 - Add register mappings for STM32Gxxxxx-family DAC
#2273 stm32/stm32_spi: Add SPI register definitions for STM32G47xxx
#2288 stm32: Add DMAMUX register mappings and request IDs
#2325 arch/arm/src/stm32/stm32_serial.c: for flowcontrol use common idiom for enabling/disabling RX interrupts
#2473 STM32 - Add ADC register definitions for STM32G4 family
#2477 STM32 FLASH latency is calculated based on Vin
#2985 stm32 Ethernet hardening

STM32L4

#2068 STM32L4: Improvements on ADC driver
#2178 STM32L4 ADC driver: extenal event configuration
#2220 STM32L4 TIMER: Add some helper functions
#2232 STM32L4 ADC: Add injected channel support.

STM32L5

#3090 stm32l5: Optional LSE xtal drive strength ramp-up

IMXRT

#2212 imxrt: adds support for WDOG1
#2354 imxrt: Added support for DP83825I PHY
#2461 imxrt: Added NETDEV_LATEINIT option for Ethernet
#2471 imxrt: Support serial single-wire mode and fix parity settings
#2929 imxrt: changes to FlexCAN driver support

RP2040

#2916 rp2040: Raspberry Pi Pico SMP support
#2927 rp2040: Fix LDFLAGS for boot stage2
#2952 rp2040: Add I2C driver support
#2986 rp2040: Add SPI driver support
#3002 rp2040: SPI driver DMA transfer support
#3057 rp2040: Fix SPI halfword DMA transfer

NRF52

#2148 nrf52_wdt: split into low-level API and watchdog driver lower-half
#2149 nrf52832: add errata mitigation code for various RADIO issues
#2182 nrf52: support configuring no console/serial
#2189 nrf52_spi: support unconnected MISO/MOSI pins
#2207 nrf52: add POWER register definitions; support enabling DC/DC regulator
#2270 nRF52 SPI improvements
#2440 nrf52 ADC: minor fixes
#2674 nrf52_i2c: add support for I2C_M_NOSTOP and I2C_M_NOSTART flags
#2705 nrf52: Add a static copy buffer for i2c NOSTART transfers
#2712 nRF52: support stack coloration
#2717 I2C bitbang driver (and nRF52 implementation)
#2735 nRF52: add support for building SoftDevice BLE controller
#2756 nrf52: add stackcheck support

STM32H7

#2880 stm32h7: add definitions for DAC
#2955 stm32h7:Add DBGMCU missing from master
#2994 stm32h7: Allow custom clock configuration to use stdclockconfig
#3143 stm32h7: DMA BDMA does not auto disabled on completion
#3207 usbhost: Add usb host tracing strings to stm32h7
#3458 stm32h7: Adds stm32_dbgmcu.h to match stm32f7 port
#3461 stm32h7: Expose flash lock, unlock, and write protect functions to boards

STM32F7

#2209 stm32f7/stm32_serial.c: fix console re-initialisation if DMA enabled
#3489 stm32f7: Freeze tickless timer during debug halt.

Risc-V

#2470 risc-v: Introduce basic setjmp support
#2918 risc-v: up_sigdeliver missing fpu contexts.

RV64

#2928 rv64:add API up_copyfullstate for later FPU support
#3018 rv64:c906:enable DP FPU support
#3073 rv64:c906:demo protect build without the PMP
#3087 rv64: keep the stack to be 16bytes aligned
#3098 rv64:fix 64bit data type and instruction for FPU handlers
#3203 rv64:c906:add risc-v PMP and change mem map for protect build.

ESP32C3

#2870 Support for ESP32-C3 GPIO Driver
#2875 risc-v/esp32c3: Add support for Main System Watchdog Timer
#2901 esp32c3: Add system reset.
#2965 ESP32XX: Add more flash options to esptool
#3006 esp32-c3: Adds timer driver
#3007 risc-v/esp32-c3: complements serial driver
#3028 ESP32-C3: Add I2C drive
#3029 esp32-c3: Adds termios support
#3040 riscv/esp32c3: Add ESP32-C3 WLAN netcard driver
#3126 risc-v/esp32-c3: Add support to SPI Flash
#3160 riscv/esp32c3: Add standard C atomic function

BL602

#2614 bl602: Update register maps and lower half drivers
#2633 BL602: Add support for system reset modes
#2655 arch/risc-v/bl602 : add pwm onshot watchdog driver
#2659 arch/risc-v/bl602 : add spiflash(hardware sf controller)
#2669 risc-v/bl602 : add gpioirq、 i2c(master) driver.
#2804 arch/risc-v/bl602: spi_master support.
#2809 arch:risc-v:bl602: enable FPU for this target.
#2836 :risc-v:bl602:add support for elf file apps
#2991 risc-v/bl602: Add wifi and ble support

Xtensa

#1933 Add support to PSRAM using SPIRAM interface
#2014 Add the optional interrupt stack to the Xtensa architecture
#2352 Print the bakctrace on assertions
#2504 Get full backtrace from interrupts.
#3015 hostfs: Make host_stat populate st_size

ESP32

#1893 Add ESP32 WiFi adapter and driver
#1942 Implement BASIC reset logic
#1945 Added Timer Support
#1958 When PSRAM is enabled allow drivers and tasks to allocate memory from a separate internal memory
#1978 Add power management of deep-sleep
#2074 Add real-time timer support for WiFi
#2138 Add Partition and OTA device
#2199 SPI Flash driver uses global sem for all MTD
#2224 Add SPI Flash hardware encryption I/O support
#2234 Include cache workaround to PSRAM
#2242 Watchdog support (MWDTs)
#2269 Add high memory support to work with PSRAM
#2294 Refactor ESP32 Wi-Fi driver
#2296 added support to automonitor by capture
#2474 Optimize IRAM usage based on esp-idf
#2514 allows the rtc wdt to be configured in bootloader and used later
#2515 Added support for RTC WDT
#2550 enables started flag if the wdt was turned on in bootloader
#2613 Added driver api to reload counter instantly
#2716 Add AES hardware accelerator driver
#2721 Add efuse driver
#2831 Writeback PSRAM data when mapping SPI Flash address to ESP32's address bus
#2840 Add esp32_gpio_matrix_in/out to replace ROM functions
#2858 Fix a memory leak when discarding a large packet.
#2939 Refactor ESP32 WiFi driver to support station and softAP coexistence
#2947 esp32_ummap: write back spiram cache before calling Cache_Flush
#2965 Add more flash options to esptool
#2979 Add support for I2C tracing
#2983 Extract memory layout definitions to a separate header
#2999 Add WPA2 Enterprise and WPA3 support
#3003 Re-organise the different heap regions
#3048 timer driver refactor
#3233 Bugfixes and Improvements for SPI DMA Exchange function

Minor changes

#1904 xtensa: ESP32: Fixed the type of cpuint variables in esp32_emac.c
#1943 xtensa: ESP32: Fix and clean some corners of GPIOs configuration.
#1947 xtensa: esp32: Fix crash on startup
#1948 xtensa: ESP32: Fixes the GPIO's function mask test
#1960 xtensa: xtensa.h: Include sys/types.h needed if STACK_COLORATON is enabled
#1968 arm: kinetis: freedom-k64f: Declare missing NUM_BUTTONS
#1990 arm: kinetis: flexcan fixed compile error
#2120 arm: stm32h7: Fix missing 'ret' reported by Frank-Christian Kruegel
#2159 xtensa: esp32: Fix SPI master DMA RX buffer memcpy size erro
#2160 arm: stm32l4/stm32l4_adc.c: fix copy-paste mistake with CONFI
#2210 arm: stm32/stm32_adc.c: do not allow negative ref count
#2214 xtensa: esp32: Fix rt-timer issues
#2233 xtensa: esp32: Fix the memory regions with regards to the range used by the ROM
#2240 arm: nrf52 GPIO/GPIOTE: better expose pin interrupt capability
#2284 arm: stm32h7/stm32_dmamux.h: Fix errors in bitfield definitions
#2286 arm: stm32f0l0g0/stm32_dmamux.h: Fix errors in bitfield definitions
#2287 arm: stm32h7/stm32_dmamux.h: Add missing CCR SPOL defines
#2300 arm: sam34: compile error on SAM34 TWI
#2316 risc-v: minor fix
#2330 xtensa: esp32/esp32_tim.c: Fix build when debug is enabled.
#2336 arm: stm32l4: correct macros STM32L4_CAN_MCR_OFFSET, etc... to match defines
#2344 xtensa: esp32/esp32_gpio.c: Fix GPIO IRQ assert condition
#2351 xtensa: esp32: Fix issues of force-sleep
#2355 xtensa: esp32_himem: Fix issue that was preventing to map all free memory
#2361 arm: nrf52 GPIO: minor fixes
#2364 arm: stm32h7: Fix bug where more than CONFIG_MM_REGIONS would be allocated
#2372 rv64: Fix SCN/PRI.PTR definitions
#2373 risc-v: Don't use non existent "saved_status"
#2423 xetnsa: Couple of Xtensa fixes
#2448 arm: stm32/stm32h7: fix the configuration of PWM outputs when subsequent channels are not enabled
#2454 xtensa: esp32/esp32-core: Fix #ifdef warning and update MM_SECTIONS
#2483 arm: stm32: convert all STM32G47X specific code to generic STM32G4 series code
#2519 arm: imxrt: replace clock_systimespec with clock_systime_timespec
#2536 xtensa: esp32: fixes enable int function and gets apb clk frequency through function
#2546 arm: imxrt: imxrt_usdhc.c: fixed no DMA build error
#2551 arm: stm32h7x3xx_memorymap.h invalid address map for fdcan
#2554 xtensa: Esp32 wifi fixes
#2555 xtensa: esp32/esp32_spiflash.c: Writeback PSRAM data before invalidating the cache
#2559 risc-v: Remove duplicated declaration for up_irq_save and up_irq_restore
#2560 risc-v: Move csr.h to common place
#2568 risc-v: Move CSR register bit definition to csr.h
#2569 risc-v: Reuse the common up_schedule_sigaction implementation
#2570 arm: stm32g4: Fix incorrect FLASH wait states
#2573 xtensa: esp32: Bump NAME_MAX where CONFIG_ESP32_WIFI_SAVE_PARAM=y
#2584 xtensa: esp32_wifi_adapter.c: file mode for open doesn't make sense for O_RDONLY
#2589 risc-v: fix redefined CSR_INSTRET
#2612 arm: kinetis: S32K/Kinetis: Fix RTC settime prescaler
#2612 arm: S32K/Kinetis: Fix RTC settime prescaler
#2647 xtensa: esp32: Fix ESP32 serial UART tx ready check error
#2666 xtensa: esp32: Fix ESP32 SPI3 slave ops data error
#2676 arm: stm32412: Fixes pinmap CAN1
#2689 arm: tiva: Fix lm3s_ethernet.c with DEBUGASSERT
#2700 arm: nRF52 various minor fixes
#2708 xtensa: esp32: Fix ESP32 I2C driver issues
#2709 xtensa: esp32: Fix ESP32 SPI driver issues
#2722 arm: stm32f412:Replaced Kludged pinmap with one for SoC.
#2725 arm: nRF52: FIX wrong bitmask for DRIVE setting
#2727 xtensa: esp32_free_cpuint: Fix an assertion
#2728 xtensa: esp32_dma_init: Fix a dubious assertion
#2731 xtensa: esp_allocateheap.c: Correct ROM memory boundaries in SMP case
#2752 xtensa: esp32/esp32_spiflash.c: Fix the value of the page start address when invalidating the cache
#2755 xtensa: esp32: Fix compile errors with CONFIG_SMP=y
#2757 xtensa: esp32/esp32_wifi_adapter.c: Print debug output only when DEBUG_WIRLESS* are enabled
#2758 xtensa: Kconfig: Reduce the default value of the internal memory
#2759 xtensa: esp32/psram: Fix missing configs
#2761 risc-v: Remove unused and undefined file section "Public Variables"
#2763 arm: imx6: Apply the latest imxrt/imxrt_enet.c to imx6/imx_enet.c
#2771 arm: imx6: Update imx6 enet
#2772 arm: imx6 enet with TCP_WRITE_BUFFERS
#2777 arm: imx6: Fix a compile error with CONFIG_DEBUG_ASSERTIONS=y
#2779 arm: samv7/sam_mcan.c: fix some mismatches caused by renaming
#2782 arm: nRF52 fixes
#2788 risc-v: Don't declare riscv_addregion if CONFIG_MM_REGIONS is < 1.
#2791 arm: stm32f7/stm32_qspi.c: Fix warning of format strings
#2792 arm: [imxrt] Fix FlexCAN tx dropping frames
#2793 risc-v: Remove nx_start prototype from riscv_internal.h
#2795 arm: stm32f412:Corrected Pin count
#2796 xtensa: esp32: Fix cache issue detected by DEBUG_ASSERTION
#2799 RV64: handle relocation type R_RISCV_CALL_PLT in PIC build.
#2805 arm: imxrt1060 iperf
#2812 xtensa: esp32_spiflash.c: Fix preprocessor condition
#2813 xtensa: esp32: Add extern modifier to ROM function declaration
#2815 riscv: Fix files names in headers that were still using the old 'up_' prefix
#2832 xtensa: esp32: Fix the issue of WiFi internal malloc from PSRAM
#2844 risc-v: LiteX: Make Arty-A7 example work
#2867 arm: lpc17xx_40xx/lpc17_40_i2c.c: Propagate I2C I/O errors
#2886 arm: pic32mz: Chip does not have ANSEL register on port K
#2889 arm: pic32mx7 cannot perform context switch
#2892 risc-v: esp32-c3: Don't reserve any vectors for any special use.
#2893 risc-v: esp32-c3: Build serial driver only when selected
#2903 xtensa: esp32: xtensa_user: Implement a few more instructions
#2912 risc-v: esp32-c3: Fix CPU interrupts freeing on WDT driver
#2917 arm: Add 'select ARM_HAVE_WFE_SEV' to ARCH_CHIP_RP2040
#2920 risc-v: esp32-c3: Configure clock and call board initialize at startup
#2923 ez80: fix several bugs in emac driver
#2931 arm: kinetis: [FlexCAN] Fix TX drop #2792 and correctly set CAN timings to non-zero
#2931 arm: s32k1xx: [FlexCAN] Fix TX drop #2792 and correctly set CAN timings to non-zero
#2943 arm: stm32x7:lse ensure it is started
#2951 arm: stm32_wwdg debug log formatting
#2967 arm: STM32F7 lse static values directly from Kconfig
#2968 xtensa: esp32: Change I2C SCL default pin to a valid one
#2972 risc-v: esp32-c3: Fix GPIO pin function configuration
#2976 xtensa: ESP32: Fix I2C Kconfig bringing the character driver as a dependency
#2977 xtensa: ESP32: Fix GPIO pin function configuration
#2996 arm: stm32h747xi: Fix missing IO_CONFIG setting
#3008 risc-v: esp32-c3: free cpu in case it was preallocated in wdt driver
#3013 risc-v: bl602:fix bl602_flash_erase to erase the wrong block
#3034 arm: imx6: Fix an error message in imx_enet.c
#3051 risc-v: Internal functions should be prefixed with riscv_ not up
#3075 arm: Fix syscall number out of swi range in thumb mode
#3079 arm: kinetis: [FlexCAN] Correct reset state for CTRL1 register
#3079 arm: s32k1xx: [FlexCAN] Correct reset state for CTRL1 register
#3088 arm: samv7: Fix sam_putreg() parameter type
#3092 xtensa: xtensa: esp32_allocateheap.c: Don't allocate ROM regions when running in QEMU.
#3116 arm: stm32l5: Enable SPI support and license clearing
#3119 xtensa: sp32: Fix buffer size word-alignment for DMA transfers
#3125 risc-v: Internal functions should be prefixed with "riscv_"
#3130 xtensa: esp32: Fix SPI polling mode when DMA is also enabled.
#3135 rv64:c906:colorize the idle stack area;minor fixes.
#3145 xtensa: esp32_part_ioctl: Return -ENOTTY for unknown commands
#3162 arm: STM32 USB OTGFSDEV: Fix handling of SETUP OUT longer than 64 bytes
#3167 arm: stm32h7:SPI Fix 16 bit SPI mode
#3174 arm: Use macro defined swi range in dispatch_syscall
#3178 arm: tiva:cc13x0_adi3_refsys fix typo
#3198 arm: Stm32h7 fix heap clobber
#3199 xtensa: ESP32: Fix math for DMA buffer length rounding
#3200 xtensa: esp32: Fix DMA burst mode being unintendedly disabled
#3219 risc-v: bl602: fix _heap_start not word aligned
#3220 arm: Fix indexing for stm32h7 usbhost tracing
#3248 xtensa: esp32: remove extra initial newline on syslog call
#3283 rv64:add memory clobber to inline asm for syscall.
#3285 arm: Remove .cpu directive from assemble file
#3293 arm: armv6-m: Remove cpsid and cpsie from exception_common
#3307 arm: Replace the hardcode syscall number with macro
#3310 arm: armv8-m: Merge ite instruction to the previous one
#3311 arm: fix the potential corruption in initialization
#3313 arm: Replace "b lr" or "mov pc, lr" with "bx lr"
#3315 arm: Move setjmp/longjmp to libc/machine
#3326 arm: Update the old arm architecture with the recent fix
#3440 arm: Change all spsr_cxsf to spsr
#3448 arm: armv7-a: Remove the special process of the nest level
#3451 arm: Remove g_irqtmp, g_undeftmp and g_aborttmp
#3452 risc-v: esp32-c3: Refactors and fixes issues on serial driver.
#3457 arm: stm32h7: Actually use the AXI SRAM as the main heap as the documentation describes in PROTECTED mode.
#3459 arm: stm32h7: Fixes build error in stm32_sdmmc.c without DCACHE
#3473 xtensa: esp32: move common XTAL and RUN_IRAM configs to ESP32 KConfig
#3486 xtensa: esp32: Improve SPI polling to use the entire HW buffer
#3492 risc-v: riscv_initialize.c: Add telnet_initialize to riscv's up_initialize
#2868 xtensa: Fix xtensa stack coloring

Simulator

New Features

#2129 add "nimble" config, to test nimBLE on top of bthcisock
#2130 rpproxy/rpserver: force use 'CONFIG_SIM_M32' for 64bit system.
#2158 linux I2C bus support in sim
#2164 add LVGL configuration which uses the X11 framebuffer and mouse
#2198 support LCD emulation over X11; correctly decouple LCD/FB from X11/NX
#2579 make it conditional with FS_FAT
#2599 names: add writev/readv into name list
#2619 hci: reuse the reserved fields of hci buffer
#2690 support sim vfork
#2696 hcitty: add hcitty adapter
#2720 board/sim: Support NuttX BLE stack through uart shim driver
#3093 add heap policy and asan logic to support mm debug on sim platform
#3152 add dlsym to nuttx-names.in
#3224 boards/sim: remove dsptest configuration
#3231 add the simulated lower-half FOC device
#3478 refactor signal handling

Bug Fixes

#2109 Revert "arch/sim: Make the SIGUSR1 host signal use the NuttX irq logic"
#2246 boards/sim/sim/sim/src/sim_touchscreen.c: add missing nx_disconnect
#2259 boards/sim: add atexit(2) into naming list
#2441 sim: fix input handling and add simulated buttons support from mouse
#2597 Revert "board/sim: Remove the too strict warning"
#3176 sim: fix signal deliver calling error on sim platform
#3205 sim: do not exit simulator on up_assert (just let the task exit)

Documentation

New Features

#1955 Add documentation for note filters and task trace guides
#1959 Documentation for the Timer Driver
#2268 Documentation for Watchdog Timer Driver
#2334 CONTRIBUTING.md: talk about preferred commit message format
#2408 Documentation: support versioned docs
#2543 Documentation: how to use auto monitor feature to keep the chip alive
#2818 Documentation: introduce hardware platforms documentation
#2819 Documentation: document nRF52832 Sparkfun board (improve MDK board a bit)
#3022 hostfs: Document the backends and restrictions
#3127 Documentation: add ESP32 and DevKitC docs
#3138 Addind CMake based C++ project example in documentation
#3490 Documentation/esp32: Add supported peripherals

Improvements

#2021 Correct the links in Documentation folder
#2024 Fix broken documentation links
#2026 Documentation: Remove all tail spaces from *.rst and *.html
#2027 Documentation: Reorganize some section
#2031 Documentation/quickstart/debugging.rst: rewrite JTAG/OpenOCD section
#2045 Documentation: Misc fixups for broken links, errors, warnings
#2051 Documentation/quickstart/debugging: rewrite SWD sentence
#2106 documentation: change non-working URL
#2329 Documentation/components/drivers/character/pwm: fix pwm.c location
#2362 Documentation improvements
#2390 Documentation: improve debugging section
#2485 Documentaiton: merge quickstart to getting started
#2563 update Documentation/components/drivers/character/watchdog.rst
#3144 CI: remove linkcheck when building docs
#3180 documentation: improve boardctl() docs
#3194 Documentation: add syslog user API and other minor improvements
#3271 docs and comments: Update stale references to COPYING
#3470 Documentation: migrate ESP32 README to docs

Driver Support

Bug Fixes

#2036 serial: break from read after closing
#2039 sensors: add unified management for sensor
#2070 bluetooth: support HCI/L2CAP sockets, support HCI RAW channel
#2139 lcd: Ssd1306 cleanup
#2142 note: Add task name record for task trace
#2146 pipes: nx_pipe syscall takes three params, also use nx_close
#2175 wireless: gs2200m: Check disassociation from AP and enable rejoin
#2188 lcd_dev: put header in correct location; fix missing const
#2200 lcd: Minor fixes to ssd1306 i2c driver
#2201 wireless: gs2200m: Add function to get IWNWID / IWFREQ / IWSENS information
#2208 lcd: add optional putarea()/getarea() operations
#2215 sensors: add new feature about sensor driver model
#2223 audio: cxd56: cleanup for the spresense audio implementation
#2315 sensors: add common circular buffer management
#2318 sensors: update l3gd20 sensor driver with new sensor driver model
#2343 serial: Prevent RX stall
#2345 mtd/mtd_progmem.c: fix progmem_log2 parameter type to match prototype
#2369 sensors: support custom types of sensor
#2370 rc: fix bug about lirc_read
#2383 USB: Do not try to print NULL format strings for verbose trace messages when disabled
#2398 rptun: fix rptun rpmsg_unregister_callback fault
#2445 audio: Make audio_null play at real speed
#2488 crypto/arc4random: rename getrandom to arc4random_buf
#2490 leds: ws2812: make frequency selection more flexible
#2497 crypto/random_pool.c: fix getrandom() when thread calling it gets can…
#2508 leds/ws2812: optimize reset bytes
#2512 wireless/bluetooth: change the tx thread stack size to DEFAULT_TASK_STACKSIZE
#2564 audio: uninitialize usermq to NULL when the device has not
#2571 bluetooth: Fix bt_buff lifecycle
#2607 wireless: bluetooth: minor fix to bluetooth stack
#2609 wireless: bluetooth: fix minor issue in bt uart driver
#2611 wireless/bluetooth: Fix vairous issues found in bt uart shim driver
#2617 serial: should include <signal.h> explicitly
#2621 syslog: Added formatted timestamps in syslog.
#2636 pipes: pty shouldn't call nx_pipe and then file_detach in kernel space
#2664 can: fix RTR ioctl and support timeout
#2691 wireless: bluetooth: add more hci event definitions
#2692 syslog: Prepend Process ID to syslog message
#2697 syslog: Added printing of log priority in syslog
#2698 syslog: Added color output to syslog.
#2704 wireless: bluetooth: minor fix for bluetooth driver
#2707 drivers: wireless: Fix ASSERT() in _read_data_len() in gs2200m.c
#2710 syslog: Re-arranged syslog fields.
#2711 sensors: bmp280: minor fixes
#2715 sensors: bmp280: convert to sensor interface (and minor sensor change)
#2738 wireless: gs2200m: Print error massages with wlerr()
#2747 wireless: gs2200m: Fix _read_data()
#2775 mtd: w25qxxxjv.c : W25Q256's sector count is 8192
#2776 net/encx24j600.c: Correct setting of ifstate
#2798 wireless: gs2200m: Change retry condition in gs2200m_hal_write()
#2801 mtd:w25qxxxjv.c: use different protect bits and address lengts
#2850 audio: Introduce a driver-specific spinlock to cxd56.c
#2907 sensors: driver model update
#2950 audio: pcm_decode: add RAW format support
#2961 syslog_rpmsg: fix system crash when open CONFIG_SCHED_HAVE_PARENT
#2989 mmcsd: Fixes race condition in event wait logic of SDMMC driver
#3000 sensors: fakesensor support batch
#3020 syslog: add option to prefix process name
#3047 mmcsd: Stuck in 1-bit mode, Removed CONFIG_ARCH_HAVE_SDIO_DELAYED_INVLDT
#3050 syslog: Added support for multiple syslog channels.
#3110 can: Add CAN FD flags to CAN header
#3118 sensors: qencoder.c - Remove bad sninfo() format string
#3163 USBDEV: RNDIS: Fix occasional disconnections due to race condition
#3185 USBDEV RNDIS: Fix unaligned access caused by 4f66624
#3195 serial: Don't comment out ws_[x|y]pixel field from winsize struct
#3201 timers: rtc/rpmsg: support server and client to set time each other
#3214 can: Fix TX ID bits 18-20 of mcp2515 can driver
#3215 syslog: Drop extra carriage return from syslog calls
#3226 syslog: Added multi device support in syslog_device.
#3269 motor: Add support for motor debug messages
#3453 syslog: Fix in syslog_intbuffer flushing
#3454 syslog: Proper uninit of syslog_device.
#3475 input: Add INPUT_TOUCHSCREEN config
#3482 input: Rename config from INPUT classes

New Driver Support

#1936 note: Add task trace support
#1989 sensors: Support fxos8700cq motion I2C sensor
#2091 usbdev: add Android Debug Bridge driver
#2166 lcd: Add LCD character driver: allows interacting with LCD directly from userspace
#2216 rc: support infrared remote control
#2282 audio: cxd56: add initial audio SRC implementation
#2301 analog: support for MAX1161X family of I2C 12 bit ADC chips
#2429 audio: add simple wm8994 codec driver
#2628 efuse: Add generic efuse driver for NuttX
#2736 console: Add generic support to LWL Console
#2829 sensor: add fakesensor driver
#3230 motor: add generic upper-half driver for Field Oriented Control (FOC)
#3474 sensors: Adds driver for hyt271 sensore module

Board Support

New Board Support

#2054 configure.sh: update custom board config build support
#2463 boards: Added Teensy-4.x BSP
#2503 Re-organise ESP32 boards and introduce two more(ESP-WROVER-KIT and the ESP32-Ethernet-Kit)
#2506 stm32: add stm32g43x support and nucleo-g431rb board
#2838 Add initial support for ESP32-C3 and ESP32-C3 DevKit board
#2877 Support for Raspberry Pi Pico
#3129 boards/stm32: add initial support for b-g431b-esc1 board
#3217 board: Add support for nucleo-h743i2
#3234 boards/stm32/common: add support for IHM07M1 and IHM08M1 boards

Boards With Significant Improvements

CXD56

#1939 Add cxd56xx intstack for SMP
#3016 spresense:rndis_smp
#3024 Spesense CPU activity LED support
#3084 cxd56_gnss: Add missing include header for cxd56_gnss.c
#3085 cxd56_cpu1signal: Fix an issue that gnss does not work

IMX6

#2997 boards: sabre-6quad: Add netnsh_smp configuration

IMXRT

#2004 FlexCAN driver for i.MX RT1060 MCU
#2526 boards/arm/imxrt/teensy-4.x: CDC-ACM console support
#2588 teensy-4.x Support for ST7789 controller

LPC17XX_40XX

#3239 board/arm/lpc17xx_40xx/mbed: Add userleds driver support

NRF52

#2706 board/nrf52-feather: Add simple i2c test configuration

RP2040

#2884 Update raspi-pico
#2894 boards: raspberrypi-pico: Add nshsram defconfig for SRAM build
#3014 BMP180 sensor support to RP2040
#3021 add INA219 support
#3030 boards/raspberrypi-pico: Support ENC28J60 SPI ethernet board
#3067 boards/raspberrypi-pico: Pico Display Pack (ST7789 LCD) support

SAM34

#2464 Added: MT29F2G Nand Flash block driver for sam4s-xplained-pro

STM32

#2433 Add 2.4 Inch TFT LCD Shield ILI9341 for nucleo-l152re, 8080 MCU 8-bit
#2505 boards/arm/stm32/stm32f103-minimum: cleanup
#3053 Nucleo-F446RE: added support for CAN driver
#3064 boards: refactor for nucleo-f446re and nucleo-f302r8 boards
#3097 Add configuration for testing the Sporadic Scheduler.
#3222 stm32/stm32_serial: add support for TX DMA and some improvements
#3223 stm32/stm32_pwm: add interfaces to access RCR register and TRGO
#3225 stm32/stm32_adc: various improvements for ADC
#3232 stm32/stm32_foc.c: add the lower-half FOC device support

STM32L4

#2009 Added STM32L432KC DAC support
#2837 Add missing I2C3 support on nucleo-l432kc board
#2842 board: nucleo-l432kc: Add missing i2c_master_s definition

STM32F4

#2553 boards: stm32f4discovery: Add adb configuration
#2699 boards/stm32f4discovery: Add a LWL board profile and improve the README.txt
#3052 Add support to LCD ST7789 on STM32F4Discovery
#3056 Add LCD1602 Backpack to common board

STM32F7

#3218 Integration of pysimCoder with NUTTX

STM32H7

#2353 Fix of the OTG FS HOST for nucleo-h743zi

KINETIS

#1969 freedom-k64f: Init PWM only if enabled
#1977 freedom-k64f: Support raw binary firmware format
#1980 freedom-k64f: Add renew DHCP client for netnsh
#1982 freedom-k64f: Add I2C initial support
#1999 freedom-k64f: Register on board sensor driver
#2020 freedom-k64f: Declare k64_i2cdev_initialize function
#2030 freedom-k64f: Fix k64_buttons.c
#2037 freedom-k64f: Add demo configuration
#2047 freedom-k64f: Add I2C to demo image
#2847 board/freedom-k64f: Add usbdev support with cdcacm example

BL602

#2764 boards: bl602evb flash and debug notes

C906

#3027 board:rv64:c906:support the ELF apps

ESP32C3

#2879 risc-v/esp32c3: Enable stdio buffering for esp32c3-devkit NSH config
#2897 boards/esp32c3: Add tmpfs mounting when bringing up
#3074 esp32c3-devkit: Use nx_mount to avoid overriding errno
#3261 esp32-c3: Add support to RNG peripheral

ESP32

#2507 boards/arm/stm32: add common and stm32f103-minimum support for WS2812
#2753 esp32: Enable renew for "wapi" configs
#2864 Add wapi_smp to test Wi-Fi in SMP mode
#2883 This commit implements I2C support for ESP32 (wrover kit)
#2888 This commit enables BMP180 suport for ESP32
#2971 esp32: Add board config to support MCP2515
#3071 ESP32: Mount TMPFS on board bring up
#3095 ESP32: Allow a BSS section to reside in external memory
#3117 xtensa/esp32: Use Polling instead of DMA for transfers below threshold
#3139 xtensa/esp32: Support esp32 wireless ioctl cmd
#3154 ESP32: Add Button support via BOOT button on GPIO0
#3164 xtensa/esp32: Adds oneshot timer driver.
#3190 risc-v/esp32c3: Support ESP32-C3 wireless ioctl cmd
#3192 esp32-devkitc: Make nsh the entry-point of the ostest config
#3211 esp32-devkitc: Add GPIO board support
#3270 xtensa/esp32: Refactor register access functions on SPI driver
#3303 esp32-devkitc: Add BMP180 sensor support

TIVA

#2684 boards: lm3s6965-ek: Add iperf to discover/defconfig

Minor Board Changes

#2558 boards: Remove CINCPATH and CXXINCPATH

ARM

#2079 Stm32 oled fixes pr
#2360 stm32/stm32ldiscovery: modernize board init little bit
#2500 stm32/common: devpath not long enough for apa102 and veml6070

CXD56

#2193 cxd56xx: Remove HOSTCC and HOSTCFLAGS from Make.defs

Xtensa

#2127 esp32: Added Userled support
#2802 ESP32: Refactor of POSTBUILD action
#3263 esp32: Move the WLAN initialisation to the common directory.
#3288 esp32-wrover-kit: Don't use User GPIO Subsystem to control LED
#3442 esp32 boards: BUTTON_BOOT should use PULLUP instead PULLDOWN

File System

Bug Fixes

#2073 fs: epoll_create: modify return value for epoll_create1
#2260 fs: eventfd: remove the unique minor limit
#2317 fs: flashback to release all file descriptors in group to increase debugging time.
#2339 Revert "fs/nxffs: Fix scan good block slowly and scan an invalid block"
#2532 fs/unionfs: remove excessive protection to avoid deadlock
#2540 fs: Skip call fs_checkfd if fd < 3 in fs_fdopen
#2572 fs: spiffs fixes
#2606 fs: Fix inode lock at umount2
#2618 fs: remove INODE_IS_SPECIAL() use INODE_IS_PSEUDODIR instead
#2638 fs: fs_dupfd2 should return OK if fd1 equals fd2
#2639 fs: Let files_allocate return -EMFILE instead ERROR
#2640 fs: Remove _files_close and reuse file_close
#2643 fs: Fix the race condition in file_dup
#2648 fs: Remove the special hack for pty in nx_vopen
#2660 fs: Reimplement file_open to not depend on nx_open
#2661 fs: file_dup2 shouldn't hold the file list lock
#2662 fs/inode/fs_files.c: fix DEBUGASSERT in romfs
#2667 fs: Make nx_vxxx and file_vxxx as internal functions
#2724 fs/tmpfs: Iterate the entry reversely in readdir
#2739 fs/readdir: Must reserve a byte for the NUL terminator
#2810 fs: eventfd: Convert the indent under EVENT_FD_VFS_PATH option to tab
#2852 fs: Merge fs_poll into poll_fdsetup
#2854 fs: Don't call _NX_SETERRNO in fopen and fdopen
#2861 fs: change geometry sizes from size_t to uint32_t
#2913 fs/lfs: lfs_file_sync() when littlefs_open
#2956 fs/mount: fix mount cmd break out when meet stat error
#3042 fs: vfs : Do some adjustments for epoll
#3060 fs: find_blockdriver: Don't ferr() on MTDs
#3069 fs/mmap: Clarify MAP_PRIVATE dependency on CONFIG_FS_RAMMAP
#3070 fs/mmap: Return EACCES for incompatible file descriptors
#3105 fs/epoll: correct the return value of epoll_ctl(2)
#3137 fs/littlefs: Suppport the duplication function
#3444 fs/romfs: fix open zero-byte file fail issue
#3491 fs: vfs: adjust the error code of write to be consistent with read

Significant Improvements

#2598 fs/epoll: add asynchronous epoll control support
#2841 fs: procfs meminfo improvements
#2957 fs: mqueue: add poll support
#3045 fs: Allocate file/socket dynamically
#3212 fs/lfs: Update version to 2.4.0

Networking

Improvements

#2414 net: tcp: implement the fast retransmit
#2415 net: gmp: add MULTICAST_TTL support
#2417 net: wireless: add country code control support
#2548 net: tcp: optimize TCP handshake performance
#2695 netpacket: if_addr: add interface address header
#2899 net: socket: Unify socket into file system to avoid the code duplication
#2964 net: socket_rpmsg: add socket rpmsg support
#3025 net: Add sendmsg and recvmsg to syscall list
#3081 tcp_send_buffered.c: improve tcp write buffering
#3113 net: usrsock: add send multi-elements support
#3257 net: tcp: support bind the same port with different domain

Bug Fixes

#1589 net: tcp: fix tcp socket close timeout if loss wireless connection
#2075 net: TCP-stack fix for stalled tcp sockets due to broken keepalive
#2121 net: devif: devif_callback.c: remove harmful debug check
#2257 net: callback: remove the assert check of conn instance
#2332 net/tcp: Rectified keepalive fix
#2412 net/icmp: add sanity check to avoid wild data length
#2413 net/tcp: correct the available iobs count if throttle is enabled
#2416 net/tcp: fallback to unthrottle pool to avoid deadlock
#2421 net/neighbor/neighbor_ethernet_out.c: fix build error without ICMPv6
#2465 net/procfs: handle opendir("/proc/net/") correctly
#2466 net/igmp: add sanity check to handle allocate fail
#2467 net/sockopt: Try usrsock further if the protocol not available
#2489 net: tcp: send the ACK in time after obtain ahead buffer from iobs
#2688 net: Remove duplicate forward references
#2774 net/ip: do not drop the udp packet from IP layer
#2811 net/local: Add an option to specify the prefix of named pipe
#2869 netdb.h: Add NI_MAXHOST and NI_MAXSERV
#2911 net: fix a few DP83848C and DP83825I constants
#2959 net: socket: move si_send/recv into sendmsg/recvmsg
#2978 telnet: fix crash about telnet client connect
#3037 Revert "net: tcp: Add DEBUGASSERT() in psock_tcp_send()"
#3043 net: local: Remove local_send.c since nobody use it now
#3044 net: fix local_sendmsg return length
#3062 net: tcp_sendfile.c: Remove an unused copy of CONFIG_NET_TCP_SPLIT_SIZE
#3099 net: tcp: dup: do not start the tcp monitor if unestablished
#3100 net: tcp: correct the port byte order
#3101 net: arp: add timeout to avoid infinite send wait
#3103 net: tcp: reset the connection ref count before tcp_free()
#3104 net: dev: check the available address further
#3106 net: if: remove the macro expansion of the public structure
#3221 net: tcp: tcp_send_buffered.c: Fix non-blocking I/O
#3254 net: arp: Fix arp
#3319 tcp_netpoll.c: Fix a performance issue with CONFIG_NET_TCP_WRITE_BUFFERS

Security Issues Fixed In This Release

Compatibility Concerns

PR-1890 (commit 2caf3a69e3d60ec550980f7ba897c732e7a39df7) attempts to speed up compilation time for concurrent builds by changing assignment to makefile variables CFLAGS, CPPFLAGS, CXXFLAGS, and AFLAGS from recursive = to simple :=. This causes these compile options to be expanded only once during the build.

If you are using NuttX on a custom board not in the NuttX repository, you may want to make a similar change to your Make.defs files. Change these recursive assignments:

CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
AFLAGS = $(CFLAGS) -D__ASSEMBLY__

to simple assignments:

CFLAGS := $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
AFLAGS := $(CFLAGS) -D__ASSEMBLY__

Not Necessary to Define `NuttX` in Make.defs

PR-2192 (commit 9208176f600d0d04446531909bf05710716a5ee4) refactors definition of the __NuttX__ preprocessor symbol to tools/Config.mk, so it is no longer necessary to define it in each board's Make.defs file.

If you are using NuttX on a custom board not in the NuttX repository, you may want to make a similar change to your Make.defs files.

Remove lines like this:

ARCHDEFINES = -D__NuttX__

Or remove -D__NuttX__ from lines like this:

CXXFLAGS += $(ARCHDEFINES) $(EXTRAFLAGS) -pipe -std=c++11 -D__NuttX__

More Information

How to Download

Release artifacts for all current and past NuttX releases can be downloaded at:

https://nuttx.apache.org/download/

How to Clone the Git Repository

The Apache NuttX project uses Git SCM as its version control system.

There are two primary repositories:

nuttx - The real time operating system itself.
apps - Optional applications and example programs for the operating system. You can use this repository or make your own custom one.

The main "Single Source of Truth" repositories are hosted by the ASF:

These are synchronized with repositories hosted at GitHub:

How to Contact the Community

The main forum for project communication, to ask a question, get involved, or contribute to NuttX, is our mailing list, dev@nuttx.apache.org. The list is publicly archived and searchable at https://lists.apache.org/list.html?dev@nuttx.apache.org. For more information, see NuttX Community.

Enthusiastic Contributors Welcome!

NuttX is a free open-source project. If you'd like to participate, whether it's to enhance documentation (even these release notes) or dive into the nitty gritty of some low-level drivers, please join us! You can join the conversation at our dev mailing list by emailing dev-subscribe@nuttx.apache.org. The mailing list is open to the public and archived. You can browse older messages at https://lists.apache.org/list.html?dev@nuttx.apache.org.

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More Information

How to Download

How to Clone the Git Repository

How to Contact the Community

Enthusiastic Contributors Welcome!