Re: ATA 100

[David Balazic <david.balazic@uni-mb.si>]

Vojtech Pavlik (vojtech@suse.cz) wrote :

> 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. 

Any chance of auto detecting this ?
I just hate when linux is relaying on the BIOS ...

BTW , why are there 666 CONFIG_.*IDE.*DMA.* switches ?

-- 
David Balazic
--------------
"Be excellent to each other." - Bill & Ted
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