> >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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