From: Jeff Garzik <jeff@garzik.org>
To: Tejun Heo <htejun@gmail.com>
Cc: Kevin Hilman <khilman@mvista.com>, linux-ide@vger.kernel.org
Subject: Re: PCI SATA controllers on embedded, no-BIOS targets
Date: Fri, 08 Sep 2006 08:00:18 -0400 [thread overview]
Message-ID: <45015B52.3000800@garzik.org> (raw)
In-Reply-To: <45011B44.3060101@gmail.com>
Tejun Heo wrote:
> IIRC, Kevin's platform can't do any MMIO. Also, although sata_sil can
> be made to use 32-bit address space exclusively, I think having PIO
> access in the meantime can be helpful to many newer ATI mips platforms
> out there. Please note that w/ ioread/write change, the modified code
> is isolated into init_one(), so the added complexity is small.
Having PIO but not MMIO is _highly_ irregular, especially for non-x86
platforms. MMIO is much more common because it is easier to implement
in hardware than PIO.
As an aside: We should add a 32-bit variant of ->data_xfer hooks, and
use where appropriate.
Jeff
next prev parent reply other threads:[~2006-09-08 12:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-22 16:37 PCI SATA controllers on embedded, no-BIOS targets Kevin Hilman
2006-08-22 16:41 ` Tejun Heo
2006-08-22 16:52 ` Kevin Hilman
2006-08-22 17:26 ` Tejun Heo
2006-08-22 17:31 ` Tejun Heo
2006-08-22 17:37 ` Kevin Hilman
2006-08-22 18:00 ` Tejun Heo
2006-08-22 18:02 ` Tejun Heo
2006-08-22 21:58 ` Kevin Hilman
2006-08-23 3:24 ` Tejun Heo
2006-08-23 3:52 ` Tejun Heo
2006-09-07 23:05 ` Kevin Hilman
2006-09-08 1:46 ` Jeff Garzik
2006-09-08 7:27 ` Tejun Heo
2006-09-08 12:00 ` Jeff Garzik [this message]
2006-09-08 16:29 ` Kevin Hilman
2006-09-08 16:40 ` Sergei Shtylyov
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