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From: Peter Risdon <peter@circlesquared.com>
To: Rob <spamrefuse@yahoo.com>
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Date: Wed, 16 Feb 2005 15:18:06 +0000
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Subject: Re: UDMA ICRC error
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On Wed, 2005-02-16 at 06:31 -0800, Rob wrote:
> Ramiro Aceves wrote:
> > 
> > I have read that others had this problem before. I
> > just write this report for you to know.
> > 
> > When I installed FreeBSD 5.3 R, I get some errors
> > like this, but I could end the install:
> > 
> > ad0: WARNING -READ_DMA UDMA ICRC error (retrying 
> >         request) LBA=5313599
> > ad0: FAILURE -READ_DMA status=51<READY,DSC,ERROR>
> >         error=84 >ICRC,ABORTED>
> > spec_getpages:(ad0s1a) I/O read failure: (error=5)
> > ................
> > 
> > I have solved the problem disabling DMA:
> > hw.ata.ata_dma="0"
> > 
> > (I previously tried disabling ACPI with no success,
> > and playing with BIOS LBA, LARGE, NORMAL settings
> > at the BIOS with no success).
> > 
> > Now ad0: works in PIO4 mode and everything is fine,
> > previously , it was UDMA33. Now there are no errors.
> 
> There's you and me now. I have this problem with two
> of my PCs. I don't know yet of anybody else who has
> these problems.
> 
> It's indeed a serious problem, but too few people
> running 5.3 seem to suffer from this.

No, it's a known problem and I filed a pr about it a while back. So far
as I know, there's been no action on the pr and disabling dma is the
only workaround.
> 
> Have you tried with 4.11?
> I bet that would not generate these problems.

Agreed.

Peter.