[PATCH 53/61] 82xx: Set NOT_COHERENT_CACHE on 8272 with PCI.

[Kumar Gala]

On Jul 17, 2007, at 10:28 PM, David Gibson wrote:

> On Tue, Jul 17, 2007 at 08:36:11PM -0500, Scott Wood wrote:
>> I've seen significant network corruption on a PCI network
>> card (e1000) with the mpc8272ads; the corruption went away
>> when I set CONFIG_NOT_COHERENT_CACHE.
>>
>> Signed-off-by: Scott Wood <scottwood at freescale.com>
>
> Hrm... I for one would be a lot more comfortable with this patch if
> you had a theoretical explanation for why it's necessary, in addition
> to the "seems to fix things".

I agree w/David.  Have you tried turning on the  
CPU_FTR_NEED_COHERENT?  Take a look at include/asm-powerpc/cputable.h  
and search for the reference to CONFIG_PPC_83xx.

Even if that solves the problem we need to figure out of there is an  
errata or what that causes this to work.

- k