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

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Message-Id: <156C2E1E-8E67-4358-B72E-4BB67D79C2AF@kernel.crashing.org>
Date:	Wed, 20 May 2009 08:29:30 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Li Yang <leoli@...escale.com>, Wolfgang Denk <wd@...x.de>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	LKML List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [PowerPC] MPC8272ADS: fix device tree for 8 MB flash size


On May 13, 2009, at 2:42 PM, Wolfgang Denk wrote:

> 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

Scott, any feedback if our boards have 8M or 32M flash modules?

- k
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