Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Daniel P. Carvalho 6f7d54d096 arch/arm/stm32: Disable reception of self-transmitted frames.
Set ETH_MACCR_ROD unconditionally when configuring the MAC. In
half-duplex mode the MAC otherwise reflects every frame it transmits
back to its own receiver, flooding the receive path with our own
traffic right as a genuine reply arrives. The bit has no effect in
full-duplex (confirmed on our hardware: fduplex=1), so setting it
unconditionally is safe and changes nothing observable for boards
already running full-duplex.

The sibling stm32f7 driver has the same gap (ETH_MACCR_ROD cleared
but never set) and stm32h7's equivalent ETH_MACCR_DO bit has the same
issue; both are left out of scope here since only m3m4_v1 hardware
was available to validate against.

Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
(cherry picked from commit 41536cb8c9f5ff448864d2eb490b35aea7cdafcf)
2026-09-19 18:32:45 -03:00
.github ci: apply Depends-On dependencies to the memory report 2026-09-15 08:47:25 -03:00
arch arch/arm/stm32: Disable reception of self-transmitted frames. 2026-09-19 18:32:45 -03:00
audio audio: limit the buffer count guard to shared ring requests 2026-08-05 07:58:53 +02:00
binfmt libs/libc/elf, binfmt: Describe the GOT by base and size, not by index. 2026-09-08 16:31:16 -03:00
boards boards: stm32g4: regenerate nucleo-g431kb comp defconfig 2026-09-19 22:41:17 +08:00
cmake cmake: fix undefined function name in parse args error messages 2026-09-11 21:15:22 +08:00
crypto tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00
Documentation Documentation,drivers/aie: align machine learning docs with current code 2026-09-19 15:16:18 -03:00
drivers drivers/timers: Add TMRDEPPATH/TMRVPATH for PTP clock drivers. 2026-09-19 18:32:45 -03:00
dummy
fs fs/inode: bound fdlist_extend() against the requested row 2026-09-17 13:50:27 +08:00
graphics graphics/nxterm: consume SGR escape sequences 2026-08-23 10:46:02 +08:00
include Documentation,drivers/aie: align machine learning docs with current code 2026-09-19 15:16:18 -03:00
libs libc/atexit: honor registrations made during exit processing 2026-09-14 18:52:46 -03:00
mm mm/iob: fix CONFIG_NET_TIMESTAMPING typo in iob_alloc 2026-09-19 16:36:47 -03:00
net net: fix pre-existing coding style issues in timestamp-related files 2026-09-18 20:00:49 +08:00
openamp cmake: Use NUTTX(_DIR/_BIN_DIR) instead CMAKE(_SRC_DIR/_BIN_DIR) 2026-08-09 11:13:08 -03:00
pass1 tools: fix stale archive members surviving a Kconfig-driven CSRCS change 2026-07-28 21:26:03 -03:00
sched sched/clock: update wall time on tickless tick and support slew limit PPM 2026-09-18 09:30:22 +08:00
syscall fs: rename PSEUDOFS_SOFTLINKS to FS_LINKS 2026-08-27 01:12:33 +08:00
tools tools/imxrt1180: Add a standalone C program for simple AHAB container creation 2026-09-19 22:38:45 +08:00
video video/videomode: Fix EDID parsing and formatting of video mode dumps 2026-08-29 11:09:11 -03:00
wireless wireless/bluetooth: Validate lengths when parsing advertising reports. 2026-09-19 18:30:43 -03:00
.asf.yaml
.codespell-ignore-lines arch/arm: Reserve r10 via ARCHCFLAGS and hoist the PIC module flags. 2026-07-24 23:09:08 +08:00
.codespellrc Revert "zbus: Add linker support and documentation for the zbus port" 2026-08-30 10:45:19 -03:00
.editorconfig
.gitignore boards/risc-v/eic7700x: Adopt the common board layout. 2026-08-19 01:40:57 +08:00
.gitmessage
.pre-commit-config.yaml
.yamllint
AUTHORS AUTHORS: add Jorge Guzman 2026-08-25 08:43:13 -04:00
CMakeLists.txt cmake: reconfigure when .config changes 2026-09-14 18:40:45 -03:00
CONTRIBUTING.md contributing: Add requirement for 'Assisted-by' commit field 2026-07-12 09:42:28 +08:00
INVIOLABLES.md
Kconfig include/nuttx: Add link-time iterable sections infrastructure 2026-08-27 01:04:05 +08:00
LICENSE libs/libdsp: Add Matrix operations 2026-07-11 14:55:59 -03:00
Makefile !boards: enforce secure ROMFS passwd and TEA key setup 2026-07-09 22:41:11 +08:00
NOTICE
README.md ci/testing: Add MemBrowse Integration 2026-06-18 12:07:41 -03:00
ReleaseNotes

POSIX Badge License Issues Tracking Badge Contributors GitHub Build Badge Documentation Badge MemBrowse

Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.

Getting Started

First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.

Documentation

You can find the current NuttX documentation on the Documentation Page.

Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.

The old NuttX documentation is still available in the Apache wiki.

Supported Boards

NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.

Contributing

If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.

License

The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.