From: William Lee Irwin III <wli@holomorphy.com>
To: sparclinux@vger.kernel.org
Subject: Re: Fix for HyperSPARC DMA errors
Date: Wed, 10 Nov 2004 03:30:10 +0000 [thread overview]
Message-ID: <20041110033010.GA3217@holomorphy.com> (raw)
In-Reply-To: <419188A0.3010307@mc.net>
On Tue, Nov 09, 2004 at 09:18:56PM -0600, Bob Breuer wrote:
> I found a solution for the HyperSPARC DMA problems in 2.6. This allows
> my SS20 with HyperSPARCs to boot to single user. It's not efficient,
> but I hope it points out whats needed for a proper fix. Seems that the
> iotlb entries need to flushed to ram or uncached since the iommu changes
> between 2.5.60 and 2.5.70.
> The second part seems to be needed to allow consistent sbus dma mappings
> to be cached on HyperSPARC. I have also tested this change on 2.4.27
> with no noticeable difference. Can anyone prove if it helps or hurts?
I'll take this for a spin on one of my SS20's. I've had no success
debugging this myself, and am astounded at how small your solution is.
-- wli
next prev parent reply other threads:[~2004-11-10 3:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-10 3:18 Fix for HyperSPARC DMA errors Bob Breuer
2004-11-10 3:30 ` William Lee Irwin III [this message]
2004-11-10 4:55 ` David S. Miller
2004-11-10 5:23 ` William Lee Irwin III
2004-11-10 5:30 ` David S. Miller
2004-11-10 5:59 ` Bob Breuer
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