linux-kernel - Re: Problems with alpha/pci + radeon/ttm

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Message-ID: <4C28C908.8090808@twiddle.net>
Date:	Mon, 28 Jun 2010 09:08:40 -0700
From:	Richard Henderson <rth@...ddle.net>
To:	Michael Cree <mcree@...on.net.nz>
CC:	Dave Airlie <airlied@...il.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	mattst88@...il.com, linux-kernel@...r.kernel.org,
	linux-alpha@...r.kernel.org, ink@...assic.park.msu.ru,
	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, alexdeucher@...il.com,
	jglisse@...hat.com
Subject: Re: Problems with alpha/pci + radeon/ttm

On 06/28/2010 02:03 AM, Michael Cree wrote:
> On 28/06/10 11:14, Dave Airlie wrote:
>> The bus error is caused by the kernel, its something alpha specific
>> with how mmap works,
>> I'm not sure if alpha needs some special mmap flags or something,
> 
> Neither am I.  All I know is that Alpha reorders CPU instructions more
> aggressively than most other architectures, the page map size is 8kB,
> and memory accesses must be aligned to the datum size.

There are no special mmap flags on alpha.  The non-cacheable property
is a function of the physical address (e.g. bit 40 set for ev5), and
this has already been taken care of by the kernel.


r~
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