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List:       linux-smp
Subject:    Re: Tyans and BIOS upgrades (Award v1.02)
From:       "Andre M. Hedrick" <hedrick () Astro ! Dyer ! Vanderbilt ! Edu>
Date:       1998-08-27 15:40:14
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On Tue, 25 Aug 1998, Dmitriy Budko wrote:

> >From:	Mark Szlaga <mszlaga@engin.umd.umich.edu>
> 
> 
> >   The UDMA support amazed the heck out of me, seeing as though the Tomcat
> >IV is a HX based chipset... I thought only the TX and newer supported that 
> >feature.  So far It seems to work like a charm, and it is _*FAST*_, though
> >I can only get it to function properly under Windows.  When I try to run it 
> >under linux I get:

I tested this on a S1563D (Tomcat III).

> >   Anyone else try this BIOS upgrade?  Does the UDMA in fact work?  Or should
> >I avaoid it with a 10 foot pole?

Yes, No, and wait until I can get a formal statement from Tyan.
The inital reports that I have are the following..........

(problem 1) : HX will never do UDMA, yet it will report its presence.

(problem 2) : BIOS 4.02 breaks IO-APIC IRQ shifting, but allow one to
              disable UDMA drive functions. (BIOS 1.02)

(problem 3) : BIOS 4.01 does not allow one to disable UDMA drive functions.
              (BIOS 1.01)

Tyan is now looking for a way to have BIOS 4.01/1.01 able to disable
UDMA drive features, to save the IO-APIC IRQ shifting.  There second
point to look in to is fixing IO-APIC IRQ shifting in BIOS 4.02/1.02.

> 
> Intel 430HX/PIIX3 does NOT support UDMA. The new BIOS may set faster
> timings for supported PIO and DMA modes. 
> 
> Dmitriy Budko	former Intel developer of BM IDE drivers for Windows 9x/NT
> 				and now BeOS kernel developer

Dmitriy is correct...........

Cheers,
Andre

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