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

Maxime Ripard maxime.ripard at free-electrons.com
Thu Jan 22 05:33:14 EST 2015


On Wed, Jan 14, 2015 at 01:37:37PM +0100, Maxime Ripard wrote:
> 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.

Is that case good enough for you?

> 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.

I'll switch this one to JFFS2 and the MTDSPLIT framework. Are you
satisfied with the NAND support? Just to know if I can continue to
model the NOR stuff on that.


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