[PATCH/RFC 0/3] UBI: unify mouting rootfs based on cmdline parameter

[Ezequiel Garcia]

Daniel,

Let's try to tackle this from a different angle.

On 27 August 2016 at 16:43, Daniel Golle <daniel at makrotopia.org> wrote:
> Hi!
>
> In an attempts to fix the flaws of the current set of UBI-related
> patches we are carrying in OpenWrt, I re-wrote the way mounting the
> rootfs from UBI in OpenWrt/LEDE works. The main requirement I face
> which cannot be easily addressed using other means which are already
> available in the kernel is the fact that UBIFS and squashfs-on-UBI
> require different parameters to be set on the cmdline, e.g.
> for UBIFS: ubi.mtd=ubi root=ubi0:rootfs rootfstype=ubifs
> for squashfs: ubi.mtd=ubi ubiblock=0,1 root=/dev/ubiblock0_1 rootfstype=squashfs
>

Can you help me understand the problem you are solving here?

So you currently need to do:

* for UBIFS: ubi.mtd=ubi root=ubi0:rootfs rootfstype=ubifs
* for squashfs: ubi.mtd=ubi ubi.block=0,1 root=/dev/ubiblock0_1
rootfstype=squashfs

[..]
>
> With those changes, a single set of cmdline parameters is
> sufficient to mount either UBIFS or any other block filesystem
> by creating a ubiblock device:
> ubi.mtd=ubi root=ubi0:rootfs rootfstype=ubifs,squashfs
>

And you would like to do:

* for UBIFS: ubi.mtd=ubi root=ubi0:rootfs rootfstype=ubifs
* for squashfs: ubi.mtd=ubi root=/dev/ubiblock0_1 rootfstype=squashfs

So the only thing you are trying to acomplish, is removal
of the ubi.block parameter needed to create ubi block devices.

Is that correct?

Thanks,
-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar