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

Imre Kaloz kaloz at openwrt.org
Fri Jan 23 07:57:44 EST 2015

On Thu, 22 Jan 2015 11:33:14 +0100, Maxime Ripard  
<maxime.ripard at free-electrons.com> wrote:

> Hi,
> 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?

Sure, but please implement UBI on NOR as a generic solution.

>> 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.

As I've written in the other mail, I'm mostly happy with it, but please  
make sure you don't hardcode available profiles but parse them.


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