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To: freebsd-questions@FreeBSD.ORG
Cc: nathan <beemern@telecom.ksu.edu>
Subject: Re: ad0: DMA problem fallback to PIO mode; HARD READ ERROR blk#25418687
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From: Arcady Genkin <antipode@thpoon.com>
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nathan <beemern@telecom.ksu.edu> writes:

> > It's a Gygabit <sp?> with an HX chipset.
> 
> any chance you could take a peek inside your box and get exact
> make/model?  or it might show up on POST (this is why i never
> 'cover' my boxes)

It's a GA-586HX.
http://www.giga-byte.com/gigabyte-web/mdiscontinued.htm#ea4d
BTW, what is POST?

It says "mode 3,4 IDE".  So I guess no DMA for disks.

Now the question is how to disable DMA in the kernel.  I see option
#options         ATA_ENABLE_ATAPI_DMA
but it's commented out.  Is there any other way to tell the kernel not
to use DMA for ata driver?

> > pcib0: <Host to PCI bridge> on motherboard
> > pci0: <PCI bus> on pcib0
> > isab0: <Intel 82371SB PCI to ISA bridge> at device 7.0 on pci0
> > isa0: <ISA bus> on isab0
> > atapci0: <Intel PIIX3 ATA controller> port 0xf000-0xf00f at device 7.1 on pci0
> > ata1: at 0x170 irq 15 on atapci0
> > ata1-master: DMA limited to UDMA33, non-ATA66 compliant cable
> > ad2: 13042MB <IBM-DPTA-371360> [26500/16/63] at ata1-master WDMA2
> > ad3: 18366MB <QUANTUM BIGFOOT TS19.2A> [37317/16/63] at ata1-slave WDMA2
> > Mounting root from ufs:/dev/ad2s1a

> rebuild your kernel withOUT DMA and see what happens

I would happily do so.  Now if I only could figure out how... ;^)
-- 
Arcady Genkin
Don't read everything you believe.


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