Hi,
Installing 6.0-RELEASE on a new machine. (Have tried 5.4 too). Using a
PCChips M848ALU motherboard with onboard SiS
IDE controller, and a Hitachi 160gb disk.
When my disk is in UDMA6 (133) mode, FreeBSD dies painfully with many
errors like:
ad0: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=316139999
ad0: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=316139999
ad0: FAILURE - WRITE_DMA48 status=51(READY,DSC,ERROR)
error=4(ABORTED) LBA=316139999
It then panics and dumps:
panic: initiate_write_inodeblock_ufs2: already started
If I disable dma using "set hw.ata.ata_dma=0" at boot, or simply boot in
safe mode, it goes into PI04 mode and works fine. Also, if I change to a
lesser UDMA value using atacontrol after boot, such as:
# atacontrol mode ad0 UDMA4
... it also seems to behave just fine. I've tried UDMA3, UDMA4, UDMA5,
all seemingly without errors. But when I use UDMA6, the machine
immediately dies when the disk gets written to.
So my question:
What's the best way to tell FreeBSD to always use UDMA5 mode on that
disk at boot time (before it attempts to use the drive)?
Thanks,
Sebastian
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