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Date: Sat, 20 Jan 2007 00:24:40 +0100
From: Martin Bochnig <mb1x@gmx.com>
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Subject: Re: [Qemu-devel] [PATCH] ATAPI CDROM DMA support is incomplete
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To: qemu-devel@nongnu.org

Hi

Juergen Keil wrote:

>Hi,
>
>
>some time ago, ATAPI DMA support was added to hw/ide.c, but the DMA 
>support is incomplete:  DMA data transfers are implemented
>for ATAPI/SCSI READ commands only (GPCMD_READ_10, GPCMD_READ_12,
>GPCMD_READ_CD), but all other ATAPI/SCSI commands still try to
>transfer data using PIO mode.
>
>Because of this problem, neither Windows ME nor Windows 2000 guests
>will use ATAPI CD DMA transfers and fall back to PIO mode.
>
>Or a OpenSolaris x86 guest will report errors like this
>"WARNING: /pci@0,0/pci-ide@1,1/ide@1 (ata1): timeout: abort request,
>target=0 lun=0" and is unable to read data from the CD (You had to
>force the ata/atapi driver to pio mode to work around this problem).
>
>
>The attached patch adds DMA support for non-READ ATAPI/SCSI commands.
>  
>
>------------------------------------------------------------------------
>
>Index: hw/ide.c
>===================================================================
>


You got it fixed once again, thank you Mr. Keil!


-MB