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Add GitHub CI
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‎.github/workflows/build.yml‎

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name: Build Kernel + DTB + initramfs + DFU Image (N31)
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on:
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push:
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pull_request:
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jobs:
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build-initramfs:
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runs-on: ubuntu-24.04
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outputs:
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artifact-path: freemyipod/initramfs.cpio.gz
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steps:
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- name: Checkout source
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uses: actions/checkout@v6
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- name: Install system dependencies
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run: |
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sudo apt-get update
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sudo apt-get install -y qemu-user-static
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- name: Cache initramfs
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id: cache
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uses: actions/cache@v5
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with:
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path: freemyipod/initramfs.cpio.gz
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key: initramfs-${{ hashFiles('freemyipod/build-initramfs.sh') }}
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- name: Build initramfs if cache miss
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if: steps.cache.outputs.cache-hit != 'true'
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run: |
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chmod +x freemyipod/build-initramfs.sh
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freemyipod/build-initramfs.sh
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echo "Initramfs built successfully at freemyipod/initramfs.cpio.gz"
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- name: Upload initramfs artifact
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uses: actions/upload-artifact@v7
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with:
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name: initramfs
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path: freemyipod/initramfs.cpio.gz
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build-kernel:
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runs-on: ubuntu-24.04
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outputs:
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zimage-path: linux/arch/arm/boot/zImage
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dtb-path: linux/arch/arm/boot/dts/samsung/s5l8740-n31.dtb
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steps:
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- name: Checkout source
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uses: actions/checkout@v6
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- name: Install system dependencies
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run: |
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sudo apt-get update
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sudo apt-get install -y \
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gcc-arm-none-eabi \
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make \
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bc \
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bison \
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flex \
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libssl-dev \
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libncurses-dev \
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device-tree-compiler \
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python3 \
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python3-pip
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- name: Install Python dependencies for dtbs_check
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run: |
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pip3 install --upgrade pip
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pip3 install dtschema yamllint
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- name: Configure kernel
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run: |
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make ARCH=arm apple_n31_defconfig
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- name: Build kernel
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run: |
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make ARCH=arm CROSS_COMPILE=arm-none-eabi- -j $(nproc) dtbs_check dtbs zImage
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- name: Copy kernel and DTB to /freemyipod
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run: |
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cp arch/arm/boot/zImage freemyipod/zImage
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cp arch/arm/boot/dts/samsung/s5l8740-n31.dtb freemyipod/s5l8740-n31.dtb
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- name: Upload kernel artifacts
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uses: actions/upload-artifact@v7
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with:
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name: kernel
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path: |
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freemyipod/zImage
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freemyipod/s5l8740-n31.dtb
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build-final-image:
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runs-on: ubuntu-24.04
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needs:
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- build-initramfs
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- build-kernel
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steps:
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- name: Checkout source
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uses: actions/checkout@v6
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- name: Download initramfs artifact
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uses: actions/download-artifact@v3
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with:
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name: initramfs
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path: freemyipod
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- name: Download kernel artifacts
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uses: actions/download-artifact@v3
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with:
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name: kernel
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path: freemyipod
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- name: Install mkimage and dtc
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run: |
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sudo apt-get update
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sudo apt-get install -y u-boot-tools device-tree-compiler
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- name: Build final image
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working-directory: freemyipod
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run: |
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mkimage -f kernel_fdt.its kernel_fdt.itb
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- name: Upload final image
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uses: actions/upload-artifact@v7
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with:
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name: dfu-image
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path: freemyipod/kernel_fdt.itb

‎freemyipod/build-initramfs.sh‎

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#!/bin/bash
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set -eEx
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ARCH=armv7
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VER=3.23.2
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MAJOR=v${VER%.*}
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TAR=alpine-minirootfs-${VER}-${ARCH}.tar.gz
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URL=https://dl-cdn.alpinelinux.org/alpine/${MAJOR}/releases/${ARCH}/${TAR}
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wget -c $URL
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WORK_DIR=$(mktemp -d)
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trap 'rm -rf "$WORK_DIR"' EXIT
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tar xf ${TAR} -C $WORK_DIR
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# create minimal /init for initramfs
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cat >"$WORK_DIR/init" <<'EOF'
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#!/bin/sh
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echo "initramfs: starting init"
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exec /sbin/init
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EOF
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chmod +x "$WORK_DIR/init"
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# setup networking
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echo 'nameserver 8.8.8.8' > "$WORK_DIR/etc/resolv.conf"
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echo nano7g > "$WORK_DIR/etc/hostname"
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cat >"$WORK_DIR/etc/network/interfaces" <<'EOF'
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auto lo
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iface lo inet
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auto usb0
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iface usb0 inet static
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address 10.0.0.2
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netmask 255.255.255.0
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gateway 10.0.0.1
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EOF
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# setup the rootfs
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cp $(which qemu-arm-static) $WORK_DIR
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# install packages
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sudo systemd-nspawn -D $WORK_DIR /qemu-arm-static /sbin/apk add dropbear openrc haveged chrony zlib evtest i2c-tools
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sudo systemd-nspawn -D $WORK_DIR /qemu-arm-static /bin/sh -c "export PATH=
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source /etc/profile
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# setup services
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for s in devfs dmesg root
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do
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rc-update add \$s sysinit
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done
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for s in chronyd bootmisc hostname sysctl haveged
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do
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rc-update add \$s boot
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done
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rc-update add networking
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rc-update add dropbear
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# pre-generate dropbear host keys
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for algo in rsa ecdsa ed25519
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do dropbearkey -t \$algo -f /etc/dropbear/dropbear_\${algo}_host_key; done
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# set root password
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echo -ne 'alpine\nalpine\n' | passwd root
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# mount sysfs
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mount -t sysfs sysfs /sys
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"
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rm -rf "$WORK_DIR/qemu-arm-static"
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# make the initramfs
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(
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find $WORK_DIR -printf "%P\0" |
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sudo cpio --directory=$WORK_DIR --null --create --verbose --owner root:root --format=newc |
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gzip -9
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) > initramfs.cpio.gz

‎freemyipod/kernel_fdt.its‎

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/dts-v1/;
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/ {
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description = "Single Linux kernel with FDT and initramfs";
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#address-cells = <1>;
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images {
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/* Linux kernel */
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kernel {
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description = "Linux kernel";
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data = /incbin/("zImage");
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type = "kernel";
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arch = "arm";
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os = "linux";
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compression = "none";
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load = <0x08000000>;
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entry = <0x08000000>;
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hash {
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algo = "crc32";
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};
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};
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/* Flattened Device Tree */
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fdt {
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description = "Flattened Device Tree blob";
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data = /incbin/("s5l8740-n31.dtb");
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type = "flat_dt";
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arch = "arm";
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compression = "none";
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hash {
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algo = "crc32";
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};
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};
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/* Gzipped initramfs */
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ramdisk {
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description = "Gzipped Initramfs";
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data = /incbin/("initramfs.cpio.gz");
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type = "ramdisk";
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arch = "arm";
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os = "linux";
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compression = "gzip";
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hash {
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algo = "crc32";
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};
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};
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};
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configurations {
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default = "conf-1";
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conf-1 {
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description = "Boot Linux kernel with FDT and initramfs";
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kernel = "kernel";
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fdt = "fdt";
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ramdisk = "ramdisk";
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};
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};
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};

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