wangchdo opened a new pull request, #17289:
URL: https://github.com/apache/nuttx/pull/17289
## Summary
Fix an issue on ARMv8-R where NEON is not supported.
When NEON is disabled, the assembly-optimized implementations
of memset and memcpy should not be used, **since the assembly code
relies on NEON instructions**.
## Impact
Fix armv8-r arch related issue, no impact to other nuttx functions
## Testing
**ostest passed on board fvp-armv8r-aarch32**
```
NuttShell (NSH)
nsh>
nsh> uname -a
NuttX 0.0.0 52b8808582 Nov 7 2025 16:45:04 arm fvp-armv8r-aarch32
nsh>
nsh> ostest
(...)
End of test memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena 7ff9d3c 7ff9d3c
ordblks 7 5
mxordblk 7fe1f10 7febf38
uordblks b60c b60c
fordblks 7fee730 7fee730
user_main: vfork() test
[ 4] ostest: arm_fork: fork context [0x2000f690]:
[ 4] ostest: arm_fork: r4:20003860 r5:00000000 r6:00000000 r7:00000000
[ 4] ostest: arm_fork: r8:00000000 r9:00000000 r10:00000000
[ 4] ostest: arm_fork: r11:00000000 sp:2000f6b8 lr:00055c9c
[ 4] ostest: nxtask_setup_fork: Child priority=100 start=0x55c9c
[ 4] ostest: nxtask_setup_fork: parent=0x2000d330, returning child=0x2000f768
[ 4] ostest: arm_fork: TCBs: Parent=0x2000d330 Child=0x2000f768
[ 4] ostest: arm_fork: Parent: stackutil:152
[ 4] ostest: arm_fork: Old stack top:2000f750 SP:2000f6b8 FP:00000000
[ 4] ostest: arm_fork: New stack top:20013a50 SP:200139b8 FP:00000000
[ 4] ostest: nxtask_start_fork: Starting Child TCB=0x2000f768
[ 4] ostest: nxtask_activate: ostest pid=85,TCB=0x2000f768
[85] ostest: nxtask_exit: ostest pid=85,TCB=0x2000f768
vfork_test: Child 85 ran successfully
Final memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena 7ff9d3c 7ff9d3c
ordblks 1 5
mxordblk 7ff08a8 7febf38
uordblks 9494 b52c
fordblks 7ff08a8 7fee810
user_main: Exiting
[ 4] ostest: nxtask_exit: ostest pid=4,TCB=0x2000d330
ostest_main: Exiting with status 0
stdio_test: Standard I/O Check: fprintf to stderr
[ 3] ostest: nxtask_exit: ostest pid=3,TCB=0x2000af10
nsh>
```
**ostest passed on board a2g-tc397-5v-tft**
```
NuttShell (NSH)
nsh>
nsh> uname -a
NuttX 0.0.0 52b8808582-dirty Nov 7 2025 16:47:22 tricore a2g-tc397-5v-tft
nsh>
nsh> ostest
(...)
user_main: scheduler lock test
sched_lock: Starting lowpri_thread at 97
sched_lock: Set lowpri_thread priority to 97
sched_lock: Starting highpri_thread at 98
sched_lock: Set highpri_thread priority to 98
sched_lock: Waiting...
sched_lock: PASSED No pre-emption occurred while scheduler was locked.
sched_lock: Starting lowpri_thread at 97
sched_lock: Set lowpri_thread priority to 97
sched_lock: Starting highpri_thread at 98
sched_lock: Set highpri_thread priority to 98
sched_lock: Waiting...
sched_lock: PASSED No pre-emption occurred while scheduler was locked.
sched_lock: Finished
End of test memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena 28dfc 28dfc
ordblks 7 6
mxordblk 1f8c8 1f8c8
uordblks 5e24 553c
fordblks 22fd8 238c0
user_main: nxevent test
End of test memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena 28dfc 28dfc
ordblks 6 6
mxordblk 1f8c8 1f8c8
uordblks 553c 553c
fordblks 238c0 238c0
Final memory usage:
VARIABLE BEFORE AFTER
======== ======== ========
arena 28dfc 28dfc
ordblks 1 6
mxordblk 24238 1f8c8
uordblks 4bc4 553c
fordblks 24238 238c0
user_main: Exiting
ostest_main: Exiting with status 0
nsh>
```
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