[OpenWrt-Devel] [PATCH 3/9] kernel: Allow ubi autoattach to run on NOR flash

Maxime Ripard maxime.ripard at free-electrons.com
Wed Jan 14 07:37:37 EST 2015

On Wed, Jan 14, 2015 at 12:43:25PM +0100, Rafał Miłecki wrote:
> On 13 January 2015 at 16:56, Maxime Ripard
> <maxime.ripard at free-electrons.com> wrote:
> > Some devices out there only have a NOR flash to store the rootfs on.
> >
> > While using UBI is arguable on this kind of NAND, this is something that should
> > be supported.
> So why use UBI at all? Doesn't it make more sense to stick to the
> JFFS2? You should be even able to easily create 2 different image
> types (one for NOR, one for NAND) in one target (see bcm53xx).

The Openblocks AX3 has a fairly large NOR (128MB) which would make
JFFS2 a rather poor choice, and the UBI overhead wouldn't be that bad.

The A385-RD board has a much smaller SPI-NOR (16MB) though, so we
could use jffs2 there, but I wasn't seeing much point at creating a
whole new layout just for a single board.

That does make sense though.


Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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