Date: Thu, 22 Sep 2005 09:09:02 -0700
From: Chris Wedgwood <cw@f00f.org>
To: David Sanchez <david.sanchez@lexbox.fr>
Cc: Jeff Garzik <jgarzik@pobox.com>, linux-kernel@vger.kernel.org
Subject: Re: How to Force PIO mode on sata promise (Linux 2.6.10)
Message-ID: <20050922160902.GA14098@taniwha.stupidest.org>
References: <17AB476A04B7C842887E0EB1F268111E026FBD@xpserver.intra.lexbox.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <17AB476A04B7C842887E0EB1F268111E026FBD@xpserver.intra.lexbox.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 993
Lines: 22

On Thu, Sep 22, 2005 at 10:03:10AM +0200, David Sanchez wrote:

> I add my card into the dma_black_list of the libata to force DMA
> disabled and the problem seems to no more appear...maybe PIO is so
> slow that the data has no time to be corrupted...  But I can NOT
> affirm that the problem is the DMA.

> I try the linux kernel 2.4,2.6.11, 2.6.12 and 2.6.13. More I try 2
> different toolchains and the problem persists...

I doubt any of those will help.  It sounds like a driver bug wrt to
non-coherent PCI.  Presumably this will also hit sparc people if they
use this hardware and some PPC too.

Does the driver use the *dma_sync* API(s)?  You might want to read
over Documentation/DMA-API.txt and see if the driver is doing the
right things.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/