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DateMon, 31 Jan 2000 22:01:59 -0800 (PST)
FromAndre Hedrick <>
SubjectRe: IDE, DMA, and lost interrupts.
On Mon, 31 Jan 2000, David Ford wrote:

> As the subject of lost interrupts is brought up again, I feel like pitching
> in again :)
> 
> Uniform Multi-Platform E-IDE driver Revision: 6.30
> PIIX4: IDE controller on PCI bus 00 dev 39
> PIIX4: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
>     ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
> hda: FUJITSU MHG2102AT, ATA DISK drive
> hdc: MATSHITA CR-175, ATAPI CDROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15


> hda: FUJITSU MHG2102AT, 9590MB w/512kB Cache, CHS=1222/255/63
> hdc: ATAPI 24X CD-ROM drive, 128kB Cache

You may have DMA enabled, but not autodma and the PIIX tuning is not in
effect.

> Uniform CD-ROM driver Revision: 3.06
> Partition check:
>  hda: hda1 hda2
> 
> If DMA is enabled in the kernel compile, the last message will instead be:
> 
>  hda: lost interrupt
> 
> and the laptop will lock up.
> 
> -- 
> Open for Y2K - Linux, we never shutdown
> 
> 
> 
> 
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> 

Andre Hedrick
The Linux ATA/IDE guy


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