From: Gunther.Mayer@t-online.de (Gunther Mayer)
To: unlisted-recipients:; (no To-header on input)@localhost.localdomain
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] parport_pc.c PnP BIOS sanity check
Date: Fri, 21 Sep 2001 20:09:10 +0200 [thread overview]
Message-ID: <3BAB8246.A688EF44@t-online.de> (raw)
In-Reply-To: <3BAAD796.A766FBEC@yahoo.co.uk>
Thomas Hood wrote:
>
> I'm still wondering why this function in parport_pc.c rejects dma
> values of zero. Is DMA0 not usable by the parallel port for some
> reason? I should think that if the PnP BIOS returns a dma of zero
> then it means that the parallel port is using DMA0. Sorry if I'm
> being obtuse. // Thomas Hood
1)
I think I saw some BIOS report DMA0 for "none" (could even have
been ACPI which is returning PNP formatted legacy resource data).
2)
I have never seen DMA0 for parport configured by a BIOS.
3)
Try "lssuperio" if you want the real hardware thing.
This qualifies the code as it is as a sanity check.
next prev parent reply other threads:[~2001-09-21 18:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-21 6:00 [PATCH] parport_pc.c PnP BIOS sanity check Thomas Hood
2001-09-21 6:11 ` Ignacio Vazquez-Abrams
2001-09-21 12:07 ` Alan Cox
2001-09-21 18:45 ` Thomas Hood
2001-09-22 0:08 ` Philip Blundell
2001-09-21 18:09 ` Gunther Mayer [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-08-13 21:46 Thomas Hood
[not found] <no.id>
2001-08-08 15:20 ` Alan Cox
2001-08-08 16:13 ` Richard B. Johnson
2001-08-08 21:58 ` H. Peter Anvin
2001-08-08 22:12 ` Russell King
2001-08-10 9:18 ` Eric W. Biederman
2001-08-08 15:15 Thomas Hood
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