Subject: Re: Trouble compiling kernel for G5.

From: Stefan Berndtsson <[email-masked]>
Date: Sun, 11 Jan 2004 02:58:35 +0100

Benjamin Herrenschmidt <[email-masked]> writes:

>>
>> ide0, timeout waiting                   for dbdma command stop
>> ide-cd: dma error
>> hda: DMA disabled
>> hda: dma error: status=0x50 { DriveReady SeekComplete }
>> hda: dma error: error=0x00
>> cdrom_newpc_intr: 4 residual after xfer
>> cdrom_newpc_intr: 4 residual after xfer
>>
>> And hdparm shows the drive to no longer have DMA turned on, which it did
>> before running growisofs.
>>
>> The same command on a B&W G3 runs fine with DMA (2.4.23 kernel).
>>
>> So, to answer your question, it seems it does not work, no.
>
> Look like an underrun again, or an alignement problem as there
> seem to be something weird with the DBDMA on the G5 at least
> (there is some "workaround" code in darwin that I haven't been
> able to understand fully yet).

Ok, I'll just sit tight and wait a bit then. :)

/Stefan

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