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Date: Wed, 9 Dec 2009 10:47:29 -0500
From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: Sean MacLennan <smaclennan@pikatech.com>
Subject: Re: [PATCH] powerpc: Increase warp SD buffer
Message-ID: <20091209154729.GT2937@zod.rchland.ibm.com>
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On Wed, Dec 09, 2009 at 10:36:45AM -0500, Sean MacLennan wrote:
>On Wed, 9 Dec 2009 09:40:55 -0500
>Josh Boyer <jwboyer@linux.vnet.ibm.com> wrote:
>
>> How does that impact the older revisions?  You're using a cuImage
>> with Warp, so the device tree is bundled with that.  If you boot a
>> new kernel with this change to the DTS on a older board revision,
>> will it do bad things?
>
>The new SD driver takes care of that. If you use the new kernel with an
>old FPGA you reserve more space than you need, but the driver will not
>touch it.
>
>And if you somehow end up with the new DTS on an older kernel, the old
>SD driver will not use the space anyway since the buffer is limited to
>one block.
>
>The SD driver is not in the kernel proper because it was implemented in
>the FPGA and has a non-standard interface. It requires a change to the
>SD core to run. But it is GPLed, so if anybody wants to see it, just
>ask.

OK thanks.  I figured something like that would be the case, but wanted to
verify first.

josh