linux-kernel - Re: [PATCH] [PowerPC] MPC8272ADS: fix device tree for 8 MB flash size

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Date:	Wed, 13 May 2009 18:28:09 +0800
From:	Li Yang <leoli@...escale.com>
To:	Wolfgang Denk <wd@...x.de>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	Scott Wood <scottwood@...escale.com>,
	Kumar Gala <galak@...nel.crashing.org>
Subject: Re: [PATCH] [PowerPC] MPC8272ADS: fix device tree for 8 MB flash size

On Wed, May 13, 2009 at 3:06 AM, Wolfgang Denk <wd@...x.de> wrote:
> The current device tree for the MPC8272ADS assumes a mapping of 32 MB
> of NOR flash at 0xFE00.0000, while there are actually only 8 MB on
> the boards, mapped at 0xFF80.0000. When booting an uImage with such a
> device tree, the kernel crashes because 0xFE00.0000 is not mapped.
>
> Also introduce aliases for serial[01] and ethernet[01].
>
> Signed-off-by: Wolfgang Denk <wd@...x.de>
> Cc: Scott Wood <scottwood@...escale.com>
> cc: Kumar Gala <galak@...nel.crashing.org>
> ---
> I am not really sure what the typical flash size on MPC8272ADS boards
> is. The board I used for testing is marked as "Prototype", so it may
> not be the release configuration. On the other hand, the manual also
> says 8 MB, Vitaly Borduk confirms 8 MB on his board, too, and Scott
> Wood eventually tested only with cuImage which fixes up the localbus
> mappings, thus eventually concealing the issue.

The latest reference board I got also has an 8MB SIMM flash module
shipped in the box.

>
> I'm posting this as reference in case the 8 MB should turn out to be
> correct. -- wd

Although 8MB seems to be the common size used.  It can be very easy
changed as a pluggable module.  It might be better to make the code
working for any reasonable flash sizes.

- Leo
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