nuttxs opened a new pull request, #18154:
URL: https://github.com/apache/nuttx/pull/18154
## Summary
board/xtensa: fixes for compilation and start-up issues when legacy boot
mode is configured.
1. Explicitly define the .rtc_reserved section to ensure RTC data that
requires a fixed address is correctly placed and does not conflict with other
sections.
2. When legacy boot is configured, vecbase must also be set and clear the
BSS section.
3. Cache must be disabled during Flash operations, so all
Flash-operation-related functions must be placed in IRAM (internal RAM). Update
the linker script for legacy boot mode.
## Impact
New Feature/Change: No
User Impact: No
Build Impact:No new Kconfig options or build system changes.
Hardware Impact: No
Security: No
Compatibility: Backward-compatible; no breaking changes.
## Testing
```
Used configs: esp32-devkitc:nsh
esp32s3-devkit:nsh
```
```
Related anomaly records:
a. Firmware compilation error
Creating esp32s3 image...
Merged 1 ELF section
A fatal error occurred: Segment loaded at 0x3c0230d0 lands in same 64KB
flash mapping as segment loaded at 0x3c020020. Can't generate binary. Suggest
changing linker script or ELF to merge sections.
tools/Unix.mk:552: recipe for target 'nuttx' failed
...
b. When cache is disabled, flash operation triggers an exception
I (191) boot: Disabling RNG early entropy source...
Guru Meditation Error: Core 0 panic'ed (LoadProhibited)
Core 0 register dump:
PC : 0x42005e5e PS : 0x00060933 A0 : 0x8200635c A1 :
0x3fc8c360
A2 : 0x00000019 A3 : 0x2e3d42df A4 : 0x3fc8b4cc A5 :
0x86826eb3
A6 : 0x3fc8b4d4 A7 : 0x04008000 A8 : 0x60008038 A9 :
0x3fc8c350
A10 : 0x000000f0 A11 : 0x00000c00 A12 : 0x00000400 A13 :
0x00000000
A14 : 0x40035880 A15 : 0x00000001 SAR : 0x00000010 EXCCAUSE:
0x0000001c
...
c. The exception vector is not set and the BSS segment is not cleared,
triggering and starting are stuck
...
```
After the fix, the above issues have not reoccurred.
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