Update README.md

- Add Linux defconfig and update build instructions
  TEST: Added Github Workflow CI that uses the new instructions
- Add Github Workflows to build u-root and Linux
  TEST: Confirmed the build binary boots u-root on RPI4

Signed-off-by: Patrick Rudolph <[email protected]>

.github/workflows/workflows.yaml

@@ -0,0 +1,72 @@
+name: Firmware build action
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    types: [opened, reopened, synchronize]
+jobs:
+  uroot_build:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/9elements/firmware-action/linux_6.1.45:f2d1f92
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+          token: ${{ secrets.MY_REPO_PAT || github.token }}
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: stable
+
+      - name: Build u-root
+        shell: bash
+        working-directory: ./u-root
+        env:
+          GOARCH: arm64
+        run: |
+          go build .
+          ./u-root -defaultsh gosh -o initramfs.cpio boot coreboot-app ./cmds/core/* ./cmds/boot/*
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: uroot-binary
+          path: |
+            ./u-root/initramfs.cpio
+
+  linux_build:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/9elements/firmware-action/linux_6.1.45:f2d1f92
+    needs: uroot_build
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+          token: ${{ secrets.MY_REPO_PAT || github.token }}
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: uroot-binary
+          path: ./u-root/
+
+      - name: Build kernel
+        shell: bash
+        working-directory: ./linux
+        env:
+          ARCH: arm64
+          CROSS_COMPILE: aarch64-linux-gnu-
+        run: |
+          make bcm2711_defconfig
+          ./scripts/kconfig/merge_config.sh .config ../acpi.conf ../uroot_initramfs.conf
+          make Image -j$(nproc)
+          make dtbs -j$(nproc)
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-binary
+          path: |
+            ./linux/arch/arm64/boot/Image
+            ./linux/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dtb
+            ./linux/.config

README.md

@@ -23,10 +23,12 @@ cd -
 
 ```
 cd linux
-echo "CONFIG_INITRAMFS_SOURCE=\"../u-root/initramfs.cpio\"" >> arch/arm64/configs/bcm2711_defconfig
-echo "CONFIG_CMDLINE_FORCE=y"                               >> arch/arm64/configs/bcm2711_defconfig
-ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make bcm2711_defconfig
-ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j$(nproc)
+export ARCH=arm64
+export CROSS_COMPILE=aarch64-linux-gnu-
+make bcm2711_defconfig
+./scripts/kconfig/merge_config.sh .config ../acpi.conf ../uroot_initramfs.conf
+make Image -j$(nproc)
+make dtbs -j$(nproc)
 cd -
 ```
 
@@ -76,3 +78,21 @@ If you do changes inside of the u-boot repository you can commit them like usual
 git subtree push --prefix u-boot [remote that points to u-boot-acpi repo] master
 ```
 This will automatically push the changes to the u-boot-acpi repository as well as keep the change in this repository.
+
+## Testing in QEMU:
+
+Starting with QEMU 9.0 you can run the RPI 4 in qemu:
+
+Update boot_cmd.txt:
+```
+fatload mmc 1:1 ${kernel_addr_r} Image
+fatsize mmc 1:1 Image
+#setenv bootargs "console=ttyS0,115200 console=tty1"
+bootefi ${kernel_addr_r}:${filesize} -
+```
+
+To run u-boot and boot from MMC run:
+```
+qemu-system-aarch64 -machine raspi4b -kernel u-boot/u-boot.bin -cpu cortex-a72 -smp 4 -m 2G -drive file=raspbian.img,format=raw,index=0 -dtb linux/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dtb -nographic
+```
+Note: Assumes you have *Image* copied into the raspbian.img image.

acpi.conf

@@ -0,0 +1,16 @@
+CONFIG_ACPI=y
+CONFIG_ACPI_DEBUGGER=y
+CONFIG_ACPI_DEBUGGER_USER=y
+CONFIG_ACPI_EC_DEBUGFS=y
+CONFIG_ACPI_DOCK=y
+CONFIG_ACPI_PCI_SLOT=y
+CONFIG_ACPI_CONTAINER=y
+CONFIG_ACPI_CUSTOM_METHOD=y
+CONFIG_ACPI_BGRT=y
+CONFIG_ACPI_APEI=y
+CONFIG_ACPI_APEI_GHES=y
+CONFIG_ACPI_APEI_EINJ=y
+CONFIG_ACPI_APEI_ERST_DEBUG=y
+CONFIG_ACPI_CONFIGFS=y
+CONFIG_ARM64_ACPI_PARKING_PROTOCOL=y
+CONFIG_CMDLINE_FORCE=y

uroot_initramfs.conf

@@ -0,0 +1 @@
+CONFIG_INITRAMFS_SOURCE="../u-root/initramfs.cpio"