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How to disable UDMA for HDD?
- Subject: How to disable UDMA for HDD?
- From: nkinkade at ub.edu.bz (Nathan Kinkade)
- Date: Mon Aug 9 08:14:37 2004
On Mon, Aug 09, 2004 at 11:10:40AM +0200, Stevan Tiefert wrote:
> 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
> 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
> Stevan Tiefert
Here are the two pertinent sysctl variables for your ATA hard disk and
These variables are read only once the kernel has been booted, so if you
want to try setting them manually you'll have to put them into
/boot/loader.conf as something like:
PGP Public Key: pgp.mit.edu:11371/pks/lookup?op=get&search=0xD8527E49
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