[OpenWrt-Devel] [PATCH] brcm2708: add squashfs rootfs image

Stijn Tintel stijn at linux-ipv6.be
Tue Apr 24 07:29:17 EDT 2018

On 27-03-18 20:42, Christian Lamparter wrote:
> This patch adds a image with squashfs as the root filesystem.
> A rootfs_data partition will be generated on the first boot
> and placed inside the rootfs partition (just after the squashfs
> image).
> advantages:
>  - it is possible to migrate from an existing -ext4
>    installation and back via sysupgrade.
>  - existing partition layout will not be lost.
>  - slightly smaller image size.
>  - support for attendedsysupgrade
> disadvantages:
>  - needs f2fs + tools as well. This is because fs-tools decides on the
>    blocksize of the sdcard. So either f2fs or ext4 can get choosen as
>    the rootfs_data filesystem (depends on the size of the root partition).
>  - rootfs_data is placed into the rootfs partition. This makes
>    it difficult for tools that expect a /dev/mmc0pX device.
>    It also makes it difficult for data recovery tools since they
>    might not expect to find a embedded partition or will be
>    confused.
> For people with existing build configurations: make sure to include mkf2fs
> and f2fsck package into the image... Otherwise the new -squashfs image will
> boot of a ram-overlay and won't keep the configurations after a reboot.
Tried to sysupgrade one of my RPi0W from ext4 to squashfs, and it
appeared to work at first, until I rebooted it again. Apparently the
overlay is completely missing, the SD card only has /boot (FAT32) and /
(squashfs). Can you please look into this? If you can get it resolved I
will merge the patch.

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