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Date:      Wed, 1 Nov 2000 23:58:48 -0600 (CST)
From:      beemern@sioux.telecom.ksu.edu
To:        Arcady Genkin <antipode@thpoon.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: ad0: DMA problem fallback to PIO mode; HARD READ ERROR blk#25418687
Message-ID:  <Pine.SOL.3.94.1001101235241.2636A-100000@sioux.telecom.ksu.edu>
In-Reply-To: <87hf5r1eso.fsf@tea.thpoon.com>

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well.. a quick search of the list archives yielded refrences to 
sysctl hw.atamodes and man ata(4)

also, look in LINT for stuff about hd flags and what-not
and.. WDMA is not the same as UDMA apparantly, man ata has details
regarding your specific chipset

hopefully one or more of those will lead you too a solution
it still COULD be bad hardware... i apologize if thats the case... your
first post looked like an easy problem at first... guess not ):

anyway... good luck!
nathan 

On 1 Nov 2000, Arcady Genkin wrote:

> nathan <beemern@telecom.ksu.edu> writes:
> 
> > > 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?
> > 
> > what file is that you are looking at?
> 
> My kernel config file.  I also looked in LINT, but didn't find
> anything new.
> 
> > see the handbook on building custom kernels on at freebsd.org for
> > complete accurate instructions
> 
> This is not what I meant.  I know how to recompile a kernel.  I just
> don't know how to disable DMA.  In my kernel config file DMA is not
> enabled...
> 
> Any ideas, anyone?
> 
> Thanks again,
> -- 
> Arcady Genkin
> Don't read everything you believe.
> 
> 
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