This repo contain a yocto layer, a set of init/recovery scripts. It will create a initramfs image, which could be used to support many fucntions, like battery monitor, recovery, multi-os boot.It's also possible to use it to create a sd-card recovery image.
Please note that it's not a complete system solution, it's rough. It's just offered to give you a thought.
+-------------------------------+
| |
| eMMC U-boot |
| |
+--------------+----------------+ +-----------+-------------+
| sd-card recovery | Kernel,Initramfs |
| ----------------------------> in |
| | SD-Card |
+--------------v----------------+ +-----------+-------------+
| |
| Kernel |
| |
+--------------+----------------+
|
|
+--------------|----------------+
| | |
| | |
| +-----------v-------------+ |
| | | |
| | Initfamfs | |
| | | |
| +-----------+-------------+ |
| | |
| | |
| +-----------v-------------+ |
| | | |
| | Rootfs | |
| | | |
| +-----------+-------------+ |
+-------------------------------+
Download rockchip yocto/oe environment.
http://opensource.rock-chips.com/wiki_Yocto
Configure with rk-minimal distro.
DISTRO=rk-minimal . ./setup-environment -b initramfs
Add meta-rockchip-initramfs to conf/bblayers.conf.
${BSPDIR}/sources/meta-rockchip-initramfs
Build initramfs image.
bitbake rk-initramfs-image
Copy image to the boot partiton.
cp initramfs/tmp/deploy/images/<MACHINE>/rk-initramfs-image.cpio.gz /media/user/boot
Set initrd in extlinux.conf.
(Note: PARTUUID is not support in this initramfs because it need udev work. It will randomly select a ext4 partition if PARTUUID is used)
default yocto
label yocto
kernel /zImage
devicetree /rk3288-evb-act8846.dtb
initrd /rk-initramfs-image-evb-rk3288.cpio.gz
append console=ttyS2,115200n8 rw root=PARTUUID=69dad710-2c rootfstype=ext4 init=/sbin/init
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