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SubjectRE: Cache coherency and snooping
I am looking at the linux kernel code. The driver in /drivers/char/agp uses
this same seqeuence to allocate non-cacheable memory page ( look at the
function static int agp_generic_create_gatt_table(void)).

I will give it a try on my mips based platform and let you guys know the

Thanks to everyone for all the responses and guidance.

-----Original Message-----
From: Rik van Riel []
Sent: Tuesday, August 13, 2002 6:38 PM
To: Imran Badr
Cc: 'Ralf Baechle'; 'Alan Cox';
Subject: RE: Cache coherency and snooping

On Tue, 13 Aug 2002, Imran Badr wrote:

> Please advise if following sequence of operations are going to help:
> alloc memory
> reserve the page
> flush every cache
> call ioremap_nocache

Won't work around hardware limitations. If the hardware
cannot turn off caching, all you could do is flush the
page to ram before every explicit IO request...


Bravely reimplemented by the knights who say "NIH".

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