Re: Congratulations on 2.1.92...

mlord (mlord@pobox.com)
Tue, 07 Apr 1998 09:28:26 -0400

root wrote:

> I've found it to be very stable on my Compaq Professional W/S 5000,
> with NEC Scsi, IDE, ESS 1868, Two Dual Pentium Pro's and 64Mb RAM.
...
> PCI_IDE: unknown IDE controller on PCI bus 0 function 161, VID=0e11,
> DID=ae33
> PCI->APIC IRQ transform: (B0,I20,P0) -> -1
> PCI_IDE: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0x2000-0x2007, BIOS settings: hda:DMA, hdb:DMA
> PCI_IDE: simplex device: DMA disabled
> ide1: PCI_IDE Bus-Master DMA disabled (BIOS), pcicmd=0x0005,
> ccode=0x101ea0a, dma_base=0x000
>
> DMA Disabled? Is this normal, or is it caused by a strange IDE controller?

Your chipset reports that it is semi-broken,
in that it cannot perform DMA transfers on
both IDE ports simultaneously.

That is just too weird for the current IDE driver,
so we just plain don't do DMA on such chipsets.
Most PCI chipsets do NOT have this problem.

The driver falls back to PIO mode instead, which allows
simultaneous use of both IDE ports.

--
mlord@pobox.com
the Linux IDE guy


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