From: Andre Hedrick <andre@aslab.com>
To: Stephen Mollett <molletts@yahoo.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: No DMA with ATAPI devices on PDC20267
Date: Sun, 10 Jun 2001 12:43:44 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.10.10106101242560.3012-100000@master.linux-ide.org> (raw)
In-Reply-To: <01061020334400.00543@cantoris>
On Sun, 10 Jun 2001, Stephen Mollett wrote:
> Greetings,
>
> When using ATAPI devices on a Promise Ultra100 (PDC20267), DMA is not
> enabled. Is this a bug in the pdc202xx driver or a limitation of the chipset?
>
> eg.
> With the drive attached to a VIA 82C686:
> hdb: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache, UDMA(25)
>
> With the drive attached to an Ultra100:
> hde: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache
>
> I have also tested this with a DVD-ROM and an LS-120 drive. Hard disks are
> fine, however.
>
> Regards,
> Stephen Mollett
>
Stephen,
I can make it do DMA ATAPI, however I have to add the code that used the
second DMA engine space.
Andre Hedrick
ASL Kernel Development
Linux ATA Development
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parent reply other threads:[~2001-06-10 19:43 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <01061020334400.00543@cantoris>]
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