gemstonedevteam opened a new pull request, #20182:
URL: https://github.com/apache/nuttx/pull/20182
### Summary
* The 16550 console provides `up_putc()`, polled character output that
works
from panic context with interrupts disabled, but the symbol was never
declared for this arch, so `SYSLOG_DEFAULT` and the assert dump could not
select it.
* The interrupt-driven console cannot flush once an assertion stops the
world,
so without `up_putc()` selected there is no path for a panic dump to
reach
the console.
### Impact
* Is new feature added? Is existing feature changed? **YES** — makes
existing
low-level console output selectable.
* Impact on user? **NO**.
* Impact on build? **NO**.
* Impact on hardware? **YES** — arch/arm/am67 only.
* Impact on documentation? **NO**.
* Impact on security? **NO**.
* Impact on compatibility? **NO** — additive Kconfig declaration.
* Anything else? Depends on PRs 3–6.
### Testing
```
Build Host(s): Pardus GNU/Linux 25 (Debian 13 base), x86_64, host gcc 14
Toolchain: arm-none-eabi-gcc 14.2.1 20241119 (15:14.2.rel1-1)
Target: arm / TI AM67 (J722S) Cortex-R5F, board t3-gem-o1:nsh
nuttx-apps: 5a7ab4200
Loaded on the main-domain R5F by Linux remoteproc; console on UART-MAIN1.
```
Testing logs before change: not captured. Without `ARCH_LOWPUTC` declared,
`SYSLOG_DEFAULT` has no polled output to select, so there is no path for a
panic dump to reach the console — there is nothing to record.
The version string in the logs is from the tested build; the commits were
GPG-signed afterwards, which rewrites hashes. The code is unchanged.
Testing logs after change:
```
make distclean && ./tools/configure.sh t3-gem-o1:nsh && make -j
-> nuttx ELF 543332 bytes, 0 compiler warnings
Test plan result:
console_alive PASS prompt responsive
version PASS NuttX version 0.0.0 0038417a4d Sep 10 2026
13:49:33 t3-gem-o1:nsh
procfs PASS procfs readable
tasks PASS 2 task lines
crash_dump PASS panic dump reached the console,
DFSR=0x00000008 (board halted; power-c
PASS=5
```
### PR verification Self-Check
* [x] This PR introduces only one functional change.
* [x] I have updated all required description fields above.
* [x] My PR adheres to Contributing Guidelines and Documentation.
* [ ] My PR is still work in progress (not ready for review).
* [x] My PR is ready for review and can be safely merged into a codebase.
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