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How to disable UDMA for HDD?



Hello,

when I try to install FreeBSD 5.2.1 on my computer with HDD on ata0-master and 
CD-ROM on ata0-slave I got five interessting messages during the 
boot-process:

...
ad0: 4124MB <SAMSUNG VA34323A> [8938/15/63] at ata0-master UDMA33
ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=8446347
ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=0
ad0: WARNING - READ_DMA interrupt was seen but timeout fired LBA=8446347
ad0: WARNING - READ_DMA interrupt was seen but taskqueue stalled LBA=8446347

then the computer stops and he resists in this state till now...
OpenBSD "downgrades" this DMA-thing automaticly and the CD-ROM seems not 
supporting UDMA and I assume to set at bootphase 3 a device.hint but I don't 
know which one?

With regards
Mr.
Stevan Tiefert

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