chore: use custom config, update CI

Author: goldmann

.github/workflows/build.yml

@@ -43,30 +43,15 @@ jobs:
 
       - name: Enable ccache
         run: |
-          echo 'export BR2_CCACHE=y' >> buildroot/.config
           echo 'export CCACHE_DIR=${HOME}/.ccache' >> $GITHUB_ENV
           echo 'export CCACHE_MAXSIZE=500M' >> $GITHUB_ENV
           echo 'export PATH="/usr/lib/ccache:$PATH"' >> $GITHUB_ENV
 
-      - name: Set Buildroot config
-        working-directory: buildroot
-        run: make raspberrypi4_64_defconfig
-
-      - name: Enable external toolchain (Linaro ARM64)
-        working-directory: buildroot
-        run: |
-          make menuconfig <<EOF
-          BR2_TOOLCHAIN_EXTERNAL=y
-          BR2_TOOLCHAIN_EXTERNAL_LINARO_AARCH64=y
-          EOF
-
       - name: Build Buildroot (parallel)
-        working-directory: buildroot
         env:
           CCACHE_DIR: ~/.ccache
-          BR2_CCACHE: y
         run: |
-          make BR2_JLEVEL=$(nproc)
+          make BR2_JLEVEL=$(nproc) -C buildroot BR2_EXTERNAL=./external rpi_4b_64
 
       - name: Upload output image
         uses: actions/upload-artifact@v4

external/configs/rpi_4b_64

@@ -0,0 +1,36 @@
+BR2_aarch64=y
+BR2_cortex_a72=y
+BR2_ARM_FPU_VFPV4=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_GLOBAL_PATCH_DIR="board/raspberrypi/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi4-64/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi4-64/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,576cc10e1ed50a9eacffc7a05c796051d7343ea4)/linux-576cc10e1ed50a9eacffc7a05c796051d7343ea4.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="bcm2711"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2711-rpi-4-b broadcom/bcm2711-rpi-400 broadcom/bcm2711-rpi-cm4 broadcom/bcm2711-rpi-cm4s"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_XZ=y
+BR2_PACKAGE_RPI_FIRMWARE=y
+BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4=y
+BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="board/raspberrypi4-64/config_4_64bit.txt"
+BR2_PACKAGE_KMOD=y
+BR2_PACKAGE_KMOD_TOOLS=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_KMOD_XZ=y
+BR2_PACKAGE_HOST_MTOOLS=y
+# Custom
+BR2_CCACHE=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_LINARO_AARCH64=y