You didn't read that error message well enough. :)
Look, you can pass a kernel parameter on boot with the
idebus=33
option to tell it to go to UDMA/33 instead of UDMA/66.
Kelsey Hudson khudson@ctica.com
Software Engineer
Compendium Technologies, Inc (619) 725-0771
---------------------------------------------------------------------------
On Wed, 24 May 2000, Jan Niehusmann wrote:
> After upgrading from 2.3.99-pre7-8 to 2.3.99-pre9-5, one of our machines
> didn't find it's partition tables any more. The only difference in the
> bootup messages is that the old kernel reports UDMA(33), and the new
> kernel reports UDMA(66) for some of the drives.
>
> >From /proc/pci:
> IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev 193).
>
> with the old kernel:
>
> 33MHz system bus speed for PIO modes; override with idebus=xx
> ALI15X3: IDE controller on PCI bus 00 dev 78
> ALI15X3: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xd400-0xd407, BIOS settings: hda:DMA, hdb:pio
> ide1: BM-DMA at 0xd408-0xd40f, BIOS settings: hdc:pio, hdd:pio
> hda: IBM-DJNA-352500, ATA DISK drive
> hdb: Maxtor 54098U8, ATA DISK drive
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> hdc: IBM-DPTA-353750, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> hda: 49981680 sectors (25591 MB) w/1966KiB Cache, CHS=3111/255/63, UDMA(33)
> hdb: 80041248 sectors (40981 MB) w/2048KiB Cache, CHS=79406/16/63, UDMA(33)
> hdc: 73261440 sectors (37510 MB) w/1961KiB Cache, CHS=72680/16/63, UDMA(33)
> Partition check:
> hda: hda1 hda2 < hda5 >
> hdb: hdb1 hdb2
> hdc: [PTBL] [4560/255/63] hdc1 hdc2
>
> The new kernel reports UDMA(66) for hdb and hdc, and doesn't find any
> partitions (not even on hda!). Then, of course, root mount fails.
> No other error messages.
>
>
> Is there a kernel option to force UDMA(33) / disable UDMA(66) ?
>
>
> Jan
>
>
> -
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