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Merged
pull merged 2 commits into from
Feb 27, 2026
Merged

[pull] master from ckormanyos:master #79

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2b38125
Add docs for the esp32p4 SBL
ckormanyos Feb 27, 2026
0998883
Merge pull request #732 from ckormanyos/esp32p4_sbl_docs
ckormanyos Feb 27, 2026
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6 changes: 6 additions & 0 deletions ref_app/target.vcxproj
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Expand Up @@ -1071,6 +1071,12 @@
<None Include="target\micros\esp32p4_riscv_soc\make\esp32p4_riscv_soc.ld" />
<None Include="target\micros\esp32p4_riscv_soc\make\esp32p4_riscv_soc_files.gmk" />
<None Include="target\micros\esp32p4_riscv_soc\make\esp32p4_riscv_soc_flags.gmk" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.bin" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.elf" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.hex" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.map" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.readelf" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\readme.md" />
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\Startup\boot.s" />
<None Include="target\micros\lpc11c24\make\lpc11c24.ld" />
<None Include="target\micros\lpc11c24\make\lpc11c24_files.gmk" />
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24 changes: 24 additions & 0 deletions ref_app/target.vcxproj.filters
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Expand Up @@ -361,6 +361,12 @@
<Filter Include="micros\esp32p4_riscv_soc\startup\Code\StdLib">
<UniqueIdentifier>{65c5c603-a019-41d0-8a19-3cadaca7fd3c}</UniqueIdentifier>
</Filter>
<Filter Include="micros\esp32p4_riscv_soc\startup\Code\SBL">
<UniqueIdentifier>{78721b7f-e97c-4ac7-906a-a571af4377b1}</UniqueIdentifier>
</Filter>
<Filter Include="micros\esp32p4_riscv_soc\startup\Code\SBL\Output">
<UniqueIdentifier>{154f1c39-5085-471e-a5c9-444517255025}</UniqueIdentifier>
</Filter>
</ItemGroup>
<ItemGroup>
<None Include="target\app\make\app_files.gmk">
Expand Down Expand Up @@ -813,6 +819,24 @@
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\Startup\boot.s">
<Filter>micros\esp32p4_riscv_soc\startup\Code\Startup</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\readme.md">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.bin">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL\Output</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.elf">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL\Output</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.hex">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL\Output</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.map">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL\Output</Filter>
</None>
<None Include="target\micros\esp32p4_riscv_soc\startup\Code\SBL\Output\SBL.readelf">
<Filter>micros\esp32p4_riscv_soc\startup\Code\SBL\Output</Filter>
</None>
</ItemGroup>
<ItemGroup>
<ClCompile Include="Target\Micros\AVR\Startup\int_vect.cpp">
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14 changes: 14 additions & 0 deletions ref_app/target/micros/esp32p4_riscv_soc/startup/Code/SBL/readme.md
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# ESP32-P4 SBL (Secondary Boot Loader)

The SBL (Secondary Boot Loader) is used in combination with the ESP-flash
tool to boot the multi-core device.

The SBL has been adopted directly from the original work in
[Chalandi/Baremetal_esp32p4_nosdk](https://github.com/Chalandi/Baremetal_esp32p4_nosdk).
In that work, the SBL code and build system can be found in the
[SBL](https://github.com/Chalandi/Baremetal_esp32p4_nosdk/tree/master/Code/SBL) directory.

The original _chalandi_ project has been used locally to build the SBL
for target `esp32p4_riscv_soc` in the `ref_app`.
The SBL-Output from that build has been archived and can be found
in the [Output](./Output) directory.
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