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

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Message-Id: <20090513194249.BA7D9832E416@gemini.denx.de>
Date:	Wed, 13 May 2009 21:42:49 +0200
From:	Wolfgang Denk <wd@...x.de>
To:	Li Yang <leoli@...escale.com>
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

Dear Li Yang,

In message <2a27d3730905130328m27743852w2d68a62ebc32ce31@...l.gmail.com> you wrote:
>
> 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.

You either have to provide a correct device tree for your board, or
use a boot loader / boot wrapper that fixes the flash base address and
size.

At the moment, U-Boot does not  contain  any  code  yet  to  do  that
(patches  welcome :-), and as far as I understand the cuImage wrapper
works just the other way  round:  it  adjusts  the  mappings  to  the
settings  in  the  device tree, which may or may not match the actual
hardware. This may work, but at least gives  you  a  different  flash
memory  map  in Linux than what you had before in U-Boot, so it's not
really nice either.

Hm... it seems the majority of MPC8272ADS boards seems to come indeed
with 8 MB NOR flash, so I wonder if the patch should actually go in?

Best regards,

Wolfgang Denk

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