Re: ATA 100 & VIA and linux-2.4.3ac8

[Vojtech Pavlik <vojtech@suse.cz>]

On Wed, Apr 18, 2001 at 10:21:53PM -0400, Manuel Ignacio Monge Garcia wrote:

> El Mié 18 Abr 2001 15:16, escribiste:
> > I don't know about other possible problems with the kernel, but you must
> > use an 80 wire IDE cable for UDMA66/100 to work.
> >
> > > -----------------------Primary IDE-------Secondary IDE------
> > > Cable Type:                   40w                 40w
> 
> 
>         Strange thing. With previous version of kernel (2.4.1 I think), I 
> haven't  got this problem. May be a bios detection problem?
> 
> Extract from /usr/src/linux/drivers/ide/via82cxxx..c:
> 
> *
> *   PIO 0-5, MWDMA 0-2, SWDMA 0-2 and UDMA 0-5
> *
> * (this includes UDMA33, 66 and 100) modes. UDMA66 and higher modes are
> * autoenabled only in case the BIOS has detected a 80 wire cable. To ignore
> * the BIOS data and assume the cable is present, use 'ide0=ata66' or
> * 'ide1=ata66' on the kernel command line.
> *
> 
> I've tried with ide0=ata100, but this options doesn't work.

Try ide0=ata66 instead. The option should have been named ide0=80wire,
but, well, "ata66" was chosen as the name, because that was it at the
time.

-- 
Vojtech Pavlik
SuSE Labs