[Solved] Espressobin: openwrt accessible after second powerup

Installing and Using OpenWrt
8

extroot overlay

Mainly, I flash the default ext4 openwrt system and then I add a third ext4 partition of the rest of the uSD (or eMMC) and will copy rootfs to it...
The the default rootfs will be used only at bootup and the pivot to extroot overlay will bring the default rootfs readonly...and can be checked and repaired... automagically !

here we go... we add the third ext4 partition
root@OWRT-DEV:/# fdisk /dev/mmcblk0


n
p
3
...
...
w
q

we make it ext4 and format it...
root@OWRT-DEV:/# mkfs.ext4 /dev/mmcblk0p3

we will then add the fstab package (block-mount)

root@OWRT-DEV:/# opkg install block-mount

We create fstab with our filesystems :
root@OWRT-DEV:/# block detect > /etc/config/fstab

We modify fstab with our configuration:
root@OWRT-DEV:/# vi /etc/config/fstab


config mount
        option enabled '1'
        option enabled_fsck '1'
        option target '/'       
        option device '/dev/mmcblk0p3'

we enable block-mount
root@OWRT-DEV:/# /etc/init.d/fstab enable

then we copy the rootfs filesystems to this third partition clone...

mkdir -p /tmp/cproot
mount --bind / /tmp/cproot
mkdir /tmp/mmcblk0p3
mount /dev/mmcblk0p3 /tmp/mmcblk0p3
tar -C /tmp/cproot -cvf - . | tar -C /tmp/mmcblk0p3 -xf -
umount /tmp/cproot
rmdir /tmp/cproot
umount /tmp/mmcblk0p3
rmdir /tmp/mmcblk0p3

we look at the mounted filestysems

root@OWRT-DEV:/# df -h

Filesystem                Size      Used Available Use% Mounted on
/dev/root               252.0M     11.8M    235.0M   5% /
tmpfs                   499.5M    432.0K    499.1M   0% /tmp
tmpfs                   512.0K         0    512.0K   0% /dev

after a reboot, we will check again :
root@OWRT-DEV:/# reboot
...

/dev/mmcblk0p3: clean, 1341/224448 files, 36986/896256 blocks
[    8.408467] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: 
[    8.418665] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[    8.429790] mount_root: switched to extroot

...
root@OWRT-DEV:/# df -h

Filesystem                Size      Used Available Use% Mounted on
/dev/root               252.0M     11.8M    235.0M   5% /rom
tmpfs                   499.5M     68.0K    499.4M   0% /tmp
/dev/mmcblk0p3            3.3G     25.4M      3.1G   1% /
tmpfs                   512.0K         0    512.0K   0% /dev

Now we can add all needed software, and have also a more stable power-fault espressobin !

Hope this helps...

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