Merge pull request #732 from ckormanyos/esp32p4_sbl_docs

Add docs for the esp32p4 SBL

Author: ckormanyos

ref_app/target.vcxproj

@@ -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" />

ref_app/target.vcxproj.filters

@@ -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">
@@ -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">

ref_app/target/micros/esp32p4_riscv_soc/startup/Code/SBL/readme.md

@@ -0,0 +1,14 @@
+# 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.