Call for testers: Apple ATA DMA

Marco Trillo marcotrillo at
Fri Sep 26 17:48:32 UTC 2008

Hi Nathan,

On Thu, Sep 25, 2008 at 8:21 PM, Nathan Whitehorn
<nwhitehorn at> wrote:
> Well I'm glad to hear that something works :)
> I just added in support for setting the timing correctly when the bus has
> multiple devices running at different speeds and also for programming
> reasonable PIO defaults for ata_macio. I hope the combination solves the
> problems seen by both you and Marcel, so more testing would be appreciated.
> As usual, the patch is here:

The patch seems to work for me, I get no hangs or errors at boot time:

ata0 mem 0x20000-0x20fff,0x8800-0x88ff irq 24,12 on macio0
ata0: [ITHREAD]
ata1: <Intrepid Kauai ATA Controller> mem 0xf5004000-0xf5007fff irq
39,1 at device 13.0 on pci2
ata1: [ITHREAD]
acd0: DVDR <HL-DT-ST RW/DVD GCC-4481B/2.05> at ata0-master WDMA2
ad0: 38166MB <Seagate ST340015A 3.01> at ata1-master UDMA100

The ad0 disk works perfectly in UDMA100 (I have tested it a lot these
days without problems).  I have not tested acd0 yet, but I'm going to
test it and report how well does it work.



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