From: Vojtech Pavlik <vojtech@suse.cz>
To: "Richard B. Johnson" <linux-os@analogic.com>
Cc: christos gentsis <christos_gentsis@yahoo.co.uk>,
linux-kernel@vger.kernel.org
Subject: Re: PCI-X support
Date: Fri, 1 Jul 2005 21:09:39 +0200 [thread overview]
Message-ID: <20050701190939.GA2154@ucw.cz> (raw)
In-Reply-To: <Pine.LNX.4.61.0507011453380.4921@chaos.analogic.com>
On Fri, Jul 01, 2005 at 03:02:11PM -0400, Richard B. Johnson wrote:
> The driver (whatever that is), if it was written for a 64-bit
> platform, can write a 64-bit word in one operation and it's
> transparent. If the driver was written for a 32-bit environment,
> it will still work because there is compatibility with PCI 2.x
>
> FYI, this machine has a PCI-X bus. I have some 32-bit cards
> plugged into it (SCSI controller, etc.). They work. I also
> have a 64-bit card plugged into it (fiber-optic data link).
> It also works, but at 133 MHz. Software never talks to it
> in 'long longs' so the increased data-width isn't being used.
Are you sure about that? I'd assume when doing busmastering, it'll use
64-bit transfers, if the driver sets the correct DMA mask.
--
Vojtech Pavlik
SuSE Labs, SuSE CR
next prev parent reply other threads:[~2005-07-01 19:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-01 17:48 PCI-X support christos gentsis
2005-07-01 18:00 ` Richard B. Johnson
2005-07-01 18:05 ` christos gentsis
2005-07-01 19:02 ` Richard B. Johnson
2005-07-01 19:09 ` Vojtech Pavlik [this message]
2005-07-01 19:25 ` Richard B. Johnson
2005-07-01 22:20 ` Krzysztof Halasa
2005-07-01 18:40 ` Vojtech Pavlik
2005-07-01 19:09 ` Greg KH
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