linux-kernel - Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

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Message-ID: <4755D1E4.3020601@garzik.org>
Date:	Tue, 04 Dec 2007 17:17:08 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Robert Hancock <hancockr@...w.ca>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

Robert Hancock wrote:
> This fixes some problems with ATAPI devices on nForce4 controllers in ADMA mode
> on systems with memory located above 4GB. We need to delay setting the 64-bit
> DMA mask until the PRD table and padding buffer are allocated so that they don't
> get allocated above 4GB and break legacy mode (which is needed for ATAPI
> devices).
> 
> Signed-off-by: Robert Hancock <hancockr@...w.ca>

This is a bit nasty :/

I would consider setting the consistent DMA mask to 32-bit, and setting 
the overall mask to 64-bit.

Seems like that would solve the problem?

Also, does this need to be rebased on top of what I just pushed upstream?

	Jeff



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