Read-Write Mirror of Apache NuttX RTOS
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Ville Juven fed3da9f03 mm_grantable.c: Fix infinite loop due to memory fragmentation
The search algorithm does not work with the ctz approach at all, if there
is a free range of granules that does not fit a specific allocation (i.e.
the granule allocation is fragmented) it will cause an infinite loop as
the algorithm will try to find free space from the same (free) starting
granule, causing an infinite loop.

The clz approach works for all cases, it will find the last used granule
and the search will continue from the next free granule.

Also, offsetting a full GAT must be sizeof(gat[0] - 1), which is 31 in
this case. The reason is that the upper level search function increments
the value by +1.
2024-12-05 20:36:04 +08:00
.github build(deps): bump codelytv/pr-size-labeler from 1.10.1 to 1.10.2 2024-11-25 13:37:09 +08:00
arch xtensa: inline up_switch_context 2024-12-05 20:32:45 +08:00
audio Fix some minor style issues 2024-11-20 10:51:07 +01:00
binfmt binfmt: migrate to SPDX identifier 2024-11-05 20:44:29 +08:00
boards arm64/lto: Fix link error after opening lto 2024-12-05 13:23:59 +08:00
cmake cmake(enhance):Enhance romfs so that RAWS files can be added in any location 2024-12-02 19:59:02 +08:00
crypto crypto: migrate to SPDX identifier 2024-11-06 20:10:37 +08:00
Documentation arm64/qemu: Add 9pfs configuration 2024-12-03 18:19:09 +08:00
drivers drivers/net: change netdev_lower_quota_load to macro. 2024-12-05 13:26:22 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs arch_atomic: only support atomic_xx and atomic64_xx function 2024-12-04 14:03:14 +01:00
graphics move readv/writev to the kernel 2024-10-30 17:07:54 +08:00
include drivers/net: change netdev_lower_quota_load to macro. 2024-12-05 13:26:22 +08:00
libs arch_atomic: only support atomic_xx and atomic64_xx function 2024-12-04 14:03:14 +01:00
mm mm_grantable.c: Fix infinite loop due to memory fragmentation 2024-12-05 20:36:04 +08:00
net net: Move NET_TCP/UDP_HAVE_STACK to netconfig.h 2024-11-21 23:07:30 +08:00
openamp Remove all jira and changeid information from the kernel 2024-11-06 02:04:03 +08:00
pass1 Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
sched addrenv: Ensure that the transmission parameter of addrenv_switch is not NULL 2024-12-04 14:20:12 +08:00
syscall Revert "system: pthread_barrierwait should be moved to kernel space" 2024-11-15 22:07:25 +08:00
tools debug symbol level: Use config instead 2024-12-04 22:36:45 +08:00
video Revert "build depend:Revert Make.dep intermediate ddc file" 2024-09-15 19:29:47 +08:00
wireless drivers/net: change netdev_lower_quota_load to macro. 2024-12-05 13:26:22 +08:00
.asf.yaml feat: add a GitHub action to lint the YAML files 2020-12-15 09:52:04 -06:00
.gitignore tools/imx9: Add norimage support to bootloader 2024-11-22 18:53:21 +08:00
.pre-commit-config.yaml Created pre-commit config file 2024-08-19 21:40:56 +02:00
.yamllint feat: add a GitHub action to lint the YAML files 2020-12-15 09:52:04 -06:00
AUTHORS AUTHORS: add Yamamoto Takashi 2024-11-04 22:29:22 +08:00
CMakeLists.txt cmake(enhance):Enhance romfs so that RAWS files can be added in any location 2024-12-02 19:59:02 +08:00
CONTRIBUTING.md Contributing and PR template fix. 2024-10-12 08:12:05 +08:00
INVIOLABLES.md INVIOLABLES.md: Fix a simple alignment and change occurrences of Nuttx 2020-09-03 01:33:05 +08:00
Kconfig debug symbol level: Use config instead 2024-12-04 22:36:45 +08:00
LICENSE libc string:Separate code. 2024-10-23 09:49:19 +08:00
Makefile tools: migrate to SPDX identifier 2024-09-10 23:11:11 +08:00
NOTICE Remove the double blank line from source files 2022-02-20 20:10:14 +01:00
README.md Gathering community recommendations 2023-10-28 13:55:56 +08:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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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.