linux-kernel - Re: SATA_SIL on IXP425 workaround

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Date:	Thu, 21 Jan 2010 22:47:20 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: SATA_SIL on IXP425 workaround

Jeff Garzik <jeff@...zik.org> writes:

> It is definitely possible to do all 32-bit accesses...  but that
> requires activating and exclusively using the command buffering
> feature, because direct 32-bit access to the taskfile registers will
> result in a 32-bit access to Data rather than the desired effect.

Command buffering? The DS for SIL3512 lists IDEx taskfile registers
for command buffering, but I can't see any explanation there.

BTW I don't know requirements of other platforms, but IXP4xx has only
problems with 8- and 16-bit PCI memory reads. Other ops including
all memory writes, and all "port" I/O are ok.

Unfortunately I can't test any patch ATM, -ENOHW. I might be able to get
access to this hw again, but I don't know at this point.
-- 
Krzysztof Halasa
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