Date: Tue, 29 Apr 2003 01:06:45 +1000 From: Stephen McKay <smckay@internode.on.net> To: freebsd-stable@freebsd.org Cc: Stephen McKay <smckay@internode.on.net> Subject: ATA driver not as good in 4.8 as 4.5? Message-ID: <200304281506.h3SF6jWq008776@dungeon.home>
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I have a Lite-On 24102B burner on an Epox 7KXA (VIA 686A southbridge)
together with a few SCSI disks. I recently upgraded from FreeBSD 4.5
to 4.7 then almost immediately to 4.8. I've had trouble with the burner
since.
With FreeBSD 4.5, I used "sysctl hw.atamodes=---,---,dma,---" to set
the burner to DMA. Everything then worked fine. As far as I know it
was using UDMA33. That's what the BIOS said it was using anyway.
With FreeBSD 4.8 I use "hw.ata.atapi_dma=1" at boot. This then tells
me it is using UDMA33. Unfortunately, I then often get this:
acd0: READ_BIG - HARDWARE ERROR asc=0x08 ascq=0x03 error=0x00
I think this means a DMA error. (PS why not say what it is?)
If I use atacontrol to downgrade to WDMA2, it works flawlessly (though
somewhat slower than it does in UDMA33 mode).
So, was 4.5 setting my hardware to WDMA2 when I thought it was doing UDMA33?
Has 4.8 introduced bugs that weren't in 4.5? Is there another setting I've
missed?
Cheers,
Stephen.
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