Re[2]: DMA !NOT ONLY! for triton again...

Re[2]: DMA !NOT ONLY! for triton again...

[Guennadi Liakhovetski]

Glad all this discussion helped at least one of us:-))

As for me, as I already mentioned in my last posting - I don't know why BIOS makes the difference (as in your case) if ide.txt says it shouldn't?! Ok, chipset, perhaps, is fine. But what about the hard drive? You told you had WDC AC21600H. Can you PLEASE check waht CCC is marked on its label? PLEASE! I am trying to get an answer from WD on this, but not yet alas...

And - COME ON, GUYS! - somebody MUST know the answer - how to spot the guilty one - kernel configuration / BIOS / chipset / disk???

Guennadi

> back in, started playing in the bios.  Finally fixed it.  I was getting > the same operation not permitted, that you
> were,until i got that bios setting. But it's making me 
> wonder if it's something similar in your bios!
> I know it wasn't the actual UDMA setting in the bios, i'm 
> wondering what it was though.  I'll put a keyboard on it,
> and poke around tonight or this weekend.
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Re: Re[2]: DMA !NOT ONLY! for triton again...

[Andre Hedrick]

Guennadi,

I have watched this and even if UDMA is not supported cleanly by the
drive, the classic ATA-2 Multi-wrod DMA should be.  There was a time in
the past where WDC had some problems, but they have fixed most if not all
with "modern" drives.  I will be at WDC in two weeks, and I can raise the
issues with them.  Please spell them out completely.

Regards,

On Mon, 4 Dec 2000, Guennadi Liakhovetski wrote:

> Well, yes, I thought they could not have known:-)) I'm absolutely stuck. If disk is fine, chipset is fine and supported by the kernel, then BIOS doesn't (or shouldn't) make a difference... Then WHAT ON THE EARTH??? Mike, have you been able to recall what BIOS option turned DMA on? Shall I write to Andre Hedrick directly? Or is there a mailing-list smth. like linux-ide?
> 
> > Now, the question is, can we trust a hard drive manufacturer
> > support tech to know what they're talking about, with evidence to
> > the contrary? :)
> 
> Thanks
> Guennadi
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> 

Andre Hedrick
CTO Timpanogas Research Group
EVP Linux Development, TRG
Linux ATA Development

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Re[2]: DMA !NOT ONLY! for triton again...

[Guennadi Liakhovetski]

Well, yes, I thought they could not have known:-)) I'm absolutely stuck. If disk is fine, chipset is fine and supported by the kernel, then BIOS doesn't (or shouldn't) make a difference... Then WHAT ON THE EARTH??? Mike, have you been able to recall what BIOS option turned DMA on? Shall I write to Andre Hedrick directly? Or is there a mailing-list smth. like linux-ide?

> Now, the question is, can we trust a hard drive manufacturer
> support tech to know what they're talking about, with evidence to
> the contrary? :)

Thanks
Guennadi
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Re[2]: DMA !NOT ONLY! for triton again...

[Guennadi Liakhovetski]

-----Original Message-----An interesting addition:
I've just got a reply from WD - they say my disk only supports PIO4 and not DMA...
> I'm taking the case off the machine right now, i can guarantee you its not UDMA compatible, simply because this thing was made in early1997. :)
> 
> Here we go:
> 
> MDL WDAC21600-00H
> P/N 99-004199-000
> CCC F3 20 FEB 97
> DCM: BHBBKLP
> 
> I've got various of these hard drives in service, for the last 4 years.  Many run in windows pc's, and DMA mode in osr2 and newer, works, and is noticeablely faster.
> 
> Guennadi Liakhovetski wrote:
> 
> > Glad all this discussion helped at least one of us:-))
> >
> > As for me, as I already mentioned in my last posting - I don't know why BIOS makes the difference (as in your case) if ide.txt says it shouldn't?! Ok, chipset, perhaps, is fine. But what about the hard drive? You told you had WDC AC21600H. Can you PLEASE check waht CCC is marked on its label? PLEASE! I am trying to get an answer from WD on this, but not yet alas...
> >
> > And - COME ON, GUYS! - somebody MUST know the answer - how to spot the guilty one - kernel configuration / BIOS / chipset / disk???
> >
> > Guennadi
> >
> > > back in, started playing in the bios.  Finally fixed it.  I was getting > the same operation not permitted, that you
> > > were,until i got that bios setting. But it's making me
> > > wonder if it's something similar in your bios!
> > > I know it wasn't the actual UDMA setting in the bios, i'm
> > > wondering what it was though.  I'll put a keyboard on it,
> > > and poke around tonight or this weekend.
> 
> 

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