Work In Progress

NuttX X.Y has not been released yet. These Release Notes are a work-in-progress in preparation for the next release of NuttX. There is a board tracking the PRs that need to be looked at to add to this doc for the OS TODO ADD LINK and for the Apps TODO ADD LINK

What's New In This Release

Major Changes to Core OS

Sched

* [#13395](https://github.com/apache/nuttx/pull/13395) Critmon optimize, make possible open cpuload based on critmon and disable critical section & sched_lock to save cost.
* [#12691](https://github.com/apache/nuttx/pull/12691) sched.h: add SCHED_BATCH and SCHED_IDLE definition
* [#12584](https://github.com/apache/nuttx/pull/12584) sched.h: CPU_XXX macros can also be used without CONFIG_SMP
* [#12703](https://github.com/apache/nuttx/pull/12703) sched.h: Update doc link for tcbinfo_s
* [#13274](https://github.com/apache/nuttx/pull/13274) sched: add DEBUGASSERT to assure that affinity not zero
* [#13341](https://github.com/apache/nuttx/pull/13341) sched: adjust the scheduling strategy
* [#13105](https://github.com/apache/nuttx/pull/13105) sched: change pthread_mutex implementation from sem to mutex
* [#12742](https://github.com/apache/nuttx/pull/12742) sched: Improve Kconfig help of INIT_ENTRYPOINT
* [#13525](https://github.com/apache/nuttx/pull/13525) sched: move DUMP_ON_EXIT to sched
* [#13211](https://github.com/apache/nuttx/pull/13211) sched: replace up_cpu_index with this_cpu
* [#13271](https://github.com/apache/nuttx/pull/13271) sched: use this_task replace nxsched_self
* [#13263](https://github.com/apache/nuttx/pull/13263) sched/event: clear pending events before enable the scheduler
* [#13329](https://github.com/apache/nuttx/pull/13329) sched/group/setuptask_file: duplicate idle task fd for kernel thread
* [#13083](https://github.com/apache/nuttx/pull/13083) sched/irq: correct critical section to spin lock 
* [#12802](https://github.com/apache/nuttx/pull/12802) sched/nxevent: add support of kernel event group
* [#13264](https://github.com/apache/nuttx/pull/13264) sched/policy: move g_policy from data to rodata
* [#13017](https://github.com/apache/nuttx/pull/13017) sched/sched: simplify the implementation of the function nxsched_readytorun_setpriority
* [#13134](https://github.com/apache/nuttx/pull/13134) sched/signal: fix pthread_kill use after free
* [#13530](https://github.com/apache/nuttx/pull/13530) sched/signal: Simplified Implementation for SIGEV_THREAD_TID
* [#12283](https://github.com/apache/nuttx/pull/12283) sched/signal: There is no need to use sched_[un]lock 
* [#12553](https://github.com/apache/nuttx/pull/12553) sched/tcb: amend pull/12320

MM

* [#12501](https://github.com/apache/nuttx/pull/12501) mm/iob: Simplify IOB alloc/free logic

libc

tools

various

Major Changes to the Build System

New Features

* [#12516](https://github.com/apache/nuttx/pull/12516) cmake:reuse OpenAMP own CMake script for CMake build

Bug Fixes

Architectural Support

New Architecture Support

Architecture Improvements

* [#12460](https://github.com/apache/nuttx/pull/12460) arch/risc-v/common: provide architecture specific perfmon bindings.
* [#12546](https://github.com/apache/nuttx/pull/12546) arch/riscv: fix NuttSBI PMP config

Driver Support

New Driver Support

* [#11605](https://github.com/apache/nuttx/pull/11605) Coresight: add init coresight driver framework

Drivers With Significant Improvements

Board Support

New Board Support

* [#11709](https://github.com/apache/nuttx/pull/11709) at32uc3a0: Initial work for SimpleMachines' Mizar32-A

Boards With Significant Improvements

* [#12544](https://github.com/apache/nuttx/pull/12544) riscv/nuttsbi: add MTVAL argument

File System

New FS

* [#13001](https://github.com/apache/nuttx/pull/13001) V9FS For NuttX

Significant Improvements

* [#13514](https://github.com/apache/nuttx/pull/13514) add sched note for littlefs/romfs/rpmsgfs
* [#12863](https://github.com/apache/nuttx/pull/12863) Fix the location of tmpfs pwrite write and Fixed some code check warnings
* [#13500](https://github.com/apache/nuttx/pull/13500) fs.h: fix a comment in file_operations
* [#12532](https://github.com/apache/nuttx/pull/12532) fs: add backtrace to where file opens
* [#13150](https://github.com/apache/nuttx/pull/13150) fs: add fs_heap, support shm/tmpfs/pseudofile with indepent heap
* [#12587](https://github.com/apache/nuttx/pull/12587) Fs: backtrace tweak
* [#13512](https://github.com/apache/nuttx/pull/13512) fs: Dump the list of files when the file description runs out
* [#13194](https://github.com/apache/nuttx/pull/13194) fs: nfs: Fix nfsmount error
* [#12978](https://github.com/apache/nuttx/pull/12978) fs: Rename node with inode.
* [#12969](https://github.com/apache/nuttx/pull/12969) Fslock optimize
* [#12937](https://github.com/apache/nuttx/pull/12937) fs/mnemofs: Fix journal log rw issue, rw size issue
* [#12945](https://github.com/apache/nuttx/pull/12945) fs/hostfs: Replace strcpy with memcpy
* [#13443](https://github.com/apache/nuttx/pull/13443) fs_inode:Change the type of i_crefs to atomic_int
* [#13458](https://github.com/apache/nuttx/pull/13458) fs_dup2 bug fix, memleak
* [#13573](https://github.com/apache/nuttx/pull/13573) fs/chmod/fchmod/lchmod: only set permissions by mode_t and ignore othjer bits
* [#12931](https://github.com/apache/nuttx/pull/12931) fs/epoll: Optimize implementation details
* [#12615](https://github.com/apache/nuttx/pull/12615) fs/fat: Fix Fseek Bug When File Size Is Multiple of Cluster Size
* [#12548](https://github.com/apache/nuttx/pull/12548) fs/fat/fs_fat32.c Return EOF when reading past the end of the file.
* [#13521](https://github.com/apache/nuttx/pull/13521) fs/dump: correct SCHED_DUMP_ON_EXIT to DUMP_ON_EXIT
* [#12990](https://github.com/apache/nuttx/pull/12990) fs/mmap: Fix build warning with [-Wmaybe-uninitialized].
* [#13132](https://github.com/apache/nuttx/pull/13132) fs/procfs: Supports any number of thread displays
* [#13123](https://github.com/apache/nuttx/pull/13123) fs/shmfs:Avoid an integer overflow
* [#12790](https://github.com/apache/nuttx/pull/12790) fs/spiffs: Return OK on `spiffs_fstat` success
* [#13407](https://github.com/apache/nuttx/pull/13407) fs/mmap: Add MADV_HUGEPAGE definitions
* [#13406](https://github.com/apache/nuttx/pull/13406) fs/mmap: Ensure anonymous pages are initialized to zero
* [#12661](https://github.com/apache/nuttx/pull/12661) fs/mnemofs: Adds Block Allocator
* [#12668](https://github.com/apache/nuttx/pull/12668) fs/mnemofs: Add parent iterator and path methods.
* [#12680](https://github.com/apache/nuttx/pull/12680) fs/mnemofs: Add LRU and CTZ methods
* [#12683](https://github.com/apache/nuttx/pull/12683) fs/mnemofs: Add journal methods.
* [#12702](https://github.com/apache/nuttx/pull/12702) fs/mnemofs: Add master node and r/w methods
* [#12943](https://github.com/apache/nuttx/pull/12943) fs/mnemofs: Autoformat
* [#12808](https://github.com/apache/nuttx/pull/12808) fs/mnemofs: Refactoring path logic, direntry size bug fix, open free bug fix
* [#12658](https://github.com/apache/nuttx/pull/12658) fs/mnemofs: Setup and VFS methods
* [#13475](https://github.com/apache/nuttx/pull/13475) fs/mount: add ftl proxy to mount block filesystem on mtd device
* [#13258](https://github.com/apache/nuttx/pull/13258) fs/mq_open: revise comments
* [#13326](https://github.com/apache/nuttx/pull/13326) fs/files_extend: Bug Fix
* [#13331](https://github.com/apache/nuttx/pull/13331) fs/inode: using inode reference to indicate unlink and simply code 
* [#13077](https://github.com/apache/nuttx/pull/13077) Fsnotify
* [#12942](https://github.com/apache/nuttx/pull/12942) Hostfs support get filepath by ioctl
* [#12817](https://github.com/apache/nuttx/pull/12817) procfs/meminfo: free delaylist  before reporting 
* [#13058](https://github.com/apache/nuttx/pull/13058) procfs/mempool: fix did not remove when pool not enabled
* [#13092](https://github.com/apache/nuttx/pull/13092) rpmsgfs: fix out of bounds access caused by data transmission farmat
* [#13063](https://github.com/apache/nuttx/pull/13063) rpmsgfs: set fs type to rpmsgfs when mount through rpmsgfs
* [#13348](https://github.com/apache/nuttx/pull/13348) smartfs procfs: fix double declare g_smartfs_operations
* [#12939](https://github.com/apache/nuttx/pull/12939) rpmsgfs_client:Fix error return exception
* [#12941](https://github.com/apache/nuttx/pull/12941) rpmsgfs: support filelock
* [#13098](https://github.com/apache/nuttx/pull/13098) tmpfs: old data was loaded when SEEK_SET beyond end of the file
* [#13490](https://github.com/apache/nuttx/pull/13490) vfs:fix a type mismatch issue and a typo

Networking

Improvements

Bug Fixes

Security Issues Fixed In This Release

Compatibility Concerns

Changes to Build System

Renamed or Modified Kconfig Options

Known Problems In This Release

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.