tmedicci opened a new pull request, #16136:
URL: https://github.com/apache/nuttx/pull/16136
## Summary
* boards/xtensa/esp32s3: Move some .bss sections to the external RAM
This PR moves some internal libraries' .bss sections to the external PSRAM
chip, freeing internal memory for other usages.
Note that it is necessary to update `esp32s3-devkit:python` defconfig,
otherwise it would fail to build.
## Impact
Impact on user: YES. It frees internal memory by moving .bss sections to the
external PSRAM.
Impact on build: NO.
Impact on hardware: NO.
Impact on documentation: NO.
Impact on security: NO.
Impact on compatibility: NO.
## Testing
The `esp32s3-devkit:python` defconfig can be used to check that the internal
memory is freed.
### Building
```
make -j distclean && ./tools/configure.sh esp32s3-devkit:python && make
-j$(nproc)
```
### Running
Just check the build log and compare the memory used by the internal memory
(`dram0_0_seg`) and the external memory (`extern_ram_seg`)
### Results
Before applying this patch:
```
Memory region Used Size Region Size %age Used
ROM: 13807672 B 33554400 B 41.15%
iram0_0_seg: 54016 B 304 KB 17.35%
irom0_0_seg: 3771426 B 33554400 B 11.24%
dram0_0_seg: 287564 B 288 KB 97.51%
drom0_0_seg: 13676600 B 33554400 B 40.76%
rtc_iram_seg: 0 GB 8168 B 0.00%
rtc_data_seg: 0 GB 8168 B 0.00%
rtc_reserved_seg: 24 B 24 B 100.00%
rtc_slow_seg: 0 GB 8 KB 0.00%
extern_ram_seg: 13846400 B 33554400 B 41.27%
```
After applying this patch, internal memory usage decreased!
```
Memory region Used Size Region Size %age Used
ROM: 13807672 B 33554400 B 41.15%
iram0_0_seg: 54016 B 304 KB 17.35%
irom0_0_seg: 3771426 B 33554400 B 11.24%
dram0_0_seg: 267356 B 288 KB 90.66%
drom0_0_seg: 13676600 B 33554400 B 40.76%
rtc_iram_seg: 0 GB 8168 B 0.00%
rtc_data_seg: 0 GB 8168 B 0.00%
rtc_reserved_seg: 24 B 24 B 100.00%
rtc_slow_seg: 0 GB 8 KB 0.00%
extern_ram_seg: 13866592 B 33554400 B 41.33%
```
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