tools/ci.sh: Install latest ARM toolchain for stm32 CI.

This is needed to build Cortex-M55 (STM32N6) based boards.

Signed-off-by: Damien George <damien@micropython.org>

.github/workflows/ports_stm32.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Install packages
-      run: tools/ci.sh stm32_setup
+      run: tools/ci.sh stm32_setup && tools/ci.sh stm32_path >> $GITHUB_PATH
     - name: Build ci_${{matrix.ci_func }}
       run: tools/ci.sh ${{ matrix.ci_func }}
 

tools/ci.sh

@@ -494,12 +494,19 @@ function ci_samd_build {
 # ports/stm32
 
 function ci_stm32_setup {
-    ci_gcc_arm_setup
+    # Use a recent version of the ARM toolchain, to work with Cortex-M55.
+    wget https://developer.arm.com/-/media/Files/downloads/gnu/14.3.rel1/binrel/arm-gnu-toolchain-14.3.rel1-x86_64-arm-none-eabi.tar.xz
+    xzcat arm-gnu-toolchain-14.3.rel1-x86_64-arm-none-eabi.tar.xz | tar x
+
     pip3 install pyelftools
     pip3 install ar
     pip3 install pyhy
 }
 
+function ci_stm32_path {
+    echo $(pwd)/arm-gnu-toolchain-14.3.rel1-x86_64-arm-none-eabi/bin
+}
+
 function ci_stm32_pyb_build {
     make ${MAKEOPTS} -C mpy-cross
     make ${MAKEOPTS} -C ports/stm32 MICROPY_PY_NETWORK_WIZNET5K=5200 submodules