initramfs config now uses overlays

board/common/overlay-initramfs/init

@@ -0,0 +1,71 @@
+#!/bin/sh
+
+set -e
+
+PATH=/bin
+BOOT_DEV=/dev/mmcblk0p1
+ROOT_DEV=/dev/mmcblk0p2
+DATA_DEV=/dev/mmcblk0p3
+
+FW_DIR=/data/.fwupdate
+FW_FILE=firmware.img.gz
+FW_FILE_EXTR=firmware.img
+
+ROOT_INFO_FILE=root_info
+
+msg() {
+    echo "* $1"
+}
+
+on_exit() {
+    msg "Switching to normal boot"
+    /normal_boot
+
+    msg "Syncing"
+    sync
+    
+    msg "Unmounting data partition"
+    umount /data
+
+    msg "Unmounting boot partition"
+    umount /boot
+    
+    msg "Rebooting"
+    echo 'b' > /proc/sysrq-trigger
+}
+
+trap on_exit EXIT
+
+msg "Waiting for sdcard"
+sleep 2
+
+msg "Mounting pseudo filesystems"
+mount -t devtmpfs devtmpfs /dev
+mount -t proc proc /proc
+
+msg "Mounting boot partition"
+mount $BOOT_DEV $BOOT
+
+msg "Mounting data partition"
+mount $DATA_DEV $DATA
+
+if ! [ -r $FW_DIR/$FW_FILE_EXTR ]; then
+    msg "No firmware found, aborting"
+    normal_boot
+fi
+
+if ! [ -r $FW_DIR/$ROOT_INFO ]; then
+    msg "No root partition info, aborting"
+    normal_boot
+fi
+
+msg "Copying root image"
+root_info=($(cat $FW_DIR/$ROOT_INFO))
+root_start=${root_info[0]}
+root_size=${root_info[1]}
+
+dd if=$FW_DIR/$FW_FILE_EXTR skip=$root_start of=$ROOT_DEV bs=1048576 count=$root_size
+
+msg "Cleaning up"
+rm -rf $FW_DIR
+

board/raspberrypi/overlay-initramfs/remove_initramfs

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+sed -i 's/^initramfs.*//g' /boot/config.txt
+

build.sh

@@ -51,6 +51,6 @@ elif [ -n "$target" ]; then
     make O=$outputdir $target
 else
     make O=$outputdir
-    $boarddir/mkimage.sh
+    test -x $boarddir/mkimage.sh && $boarddir/mkimage.sh
 fi
 

configs/raspberrypi_initramfs_defconfig

@@ -15,6 +15,7 @@ BR2_TARGET_GENERIC_HOSTNAME=""
 BR2_TARGET_GENERIC_ISSUE=""
 BR2_ROOTFS_SKELETON_CUSTOM=y
 BR2_ROOTFS_SKELETON_CUSTOM_PATH="board/common/skeleton-initramfs"
+BR2_ROOTFS_OVERLAY="board/common/overlay-initramfs board/raspberrypi/overlay-initramfs"
 BR2_PACKAGE_BUSYBOX_CONFIG="board/common/busybox_initramfs.config"
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_CPIO_GZIP=y