i'm running the kernel that comes with redhat 7.2.  (i think its 2.4.7 or 
2.4.9).  i have an abit kt7 (i know it has a UDMA 66 controller).

i tried "idebus=66" but then dmesg said something about not being able to do 
that and to try "ide0=ata66" instead.  so i tried that, and now dmesg | grep 
66 shows:

Kernel command line: ro root=/dev/hda5 hdd=ide-scsi ide0=ata66
ide_setup: ide0=ata66
VP_IDE: VIA vt82c686a (rev 22) IDE UDMA66 controller on pci00:07.1
VP_IDE: ATA-66/100 forced bit set (WARNING)!!
hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63, UDMA(66)

any idea what the warning is about?  oh well, at least the last line says 
"UDMA(66)" now...=)

christopher

On Tuesday 13 November 2001 10:04 pm, you wrote:
> On Tuesday 13 November 2001 05:14 pm, Gordon Messmer wrote:
> > On Tue, 13 Nov 2001, christopher j bottaro wrote:
> > > ide: Assuming 33MHz PCI bus speed for PIO modes; override with
> > > idebus=xx hda: 78165360 sectors (40021 MB) w/2048KiB Cache,
> > > CHS=4865/255/63, UDMA(33)
> > >
> > > but my hard drives are UDMA 100, how do i get them to run at optimal
> > > speed?
> >
> > What kernel are you running?  What motherboard?
> >
> > If the kernel reports the drives as UDMA 33, then your motherboard's
> > controller is probably only a UDMA 33 controller.
>
> I have the same thing here.
> With both kernel-2.4.9-13 and kernel-2.4.13-0.5 on a DFI  CA64-TN
> motherboard:
>
> ide: Assuming 33MHz system bus speed for PIO modes; override with
> idebus=xx
>
> VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
>
>     ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA
>     ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:DMA
>
> hda: WDC WD205BA, ATA DISK drive
> hdb: WDC AC310200R, ATA DISK drive
>
> hda: 40088160 sectors (20525 MB) w/2048KiB Cache, CHS=2495/255/63,
> UDMA(33)
> hdb: 20044080 sectors (10263 MB) w/512KiB Cache, CHS=1247/255/63, UDMA(33)
>
> -D



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