ability to run riscv builds for rp2350 and partial action support

.github/workflows/main.yml

@@ -16,6 +16,13 @@ jobs:
       matrix:
         cmake_build_type: [Debug]
         pico_board: ["pico_ice", "pico2_ice"]
+        include:
+          - pico_board: "pico_ice"
+            pico_platform: "rp2040"
+          - pico_board: "pico2_ice"
+            pico_platform: "rp2350"
+          - pico_board: "pico2_ice"
+            pico_platform: "rp2350-riscv"
         example:
           - rp2_blinky
           - rp2_blinky_cplusplus
@@ -60,5 +67,5 @@ jobs:
           cd examples/${{ matrix.example }}
           mkdir -p build
           cd build
-          cmake -DCMAKE_BUILD_TYPE=${{ matrix.cmake_build_type }} -DPICO_BOARD=${{ matrix.pico_board }} ..
+          cmake -DCMAKE_BUILD_TYPE=${{ matrix.cmake_build_type }} -DPICO_BOARD=${{ matrix.pico_board }} -DPICO_PLATFORM=${{ matrix.pico_platform }} ..
           make -j4

README.md

@@ -8,3 +8,15 @@
 | [Discord](https://discord.gg/t2CzbAYeD2)
 
 This is the SDK for building custom firmware for the RP2040 on the [pico-ice](https://pico-ice.tinyvision.ai/) board and RP2350 on [pico2-ice](https://pico2-ice.tinyvision.ai/) board.
+
+### To quickly get started:
+Provided you have the compilers setup.
+For riscv, you may add `-DPICO_GCC_TRIPLE=riscv64-unknown-elf` to the cmake command if your 'riscv64' compiler supports rp2350/rv32.
+
+- clone the repository
+- run `git submodules update --init`
+- got into the folder of the example you wish to try
+- `mkdir build && cd build`
+- `cmake -DPICO_BOARD=pico_ice ..` or `cmake -DPICO_BOARD=pico2_ice ..` or `cmake -DPICO_BOARD=pico2_ice -DPICO_PLATFORM=rp2350-riscv ..`
+- `make -j8`
+- Copy the generated uf2 to the board after setting it to flashing mode

cmake/preinit_pico_ice_sdk.cmake

@@ -7,7 +7,9 @@ if (NOT DEFINED PICO_BOARD OR PICO_BOARD STREQUAL pico_ice)
     target_compile_definitions(pico_ice_preinit_common INTERFACE PICO_ICE)
 endif()
 if (PICO_BOARD STREQUAL pico2_ice)
-    set(PICO_PLATFORM rp2350)
+    if (NOT DEFINED PICO_PLATFORM)
+        set(PICO_PLATFORM rp2350)
+    endif()
     target_compile_definitions(pico_ice_preinit_common INTERFACE PICO2_ICE)
 endif()
 list(APPEND PICO_BOARD_HEADER_DIRS "${CMAKE_CURRENT_LIST_DIR}/../include/boards")