Re: 40-wire/80-wire detection

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

Hi,

On Friday 13 July 2007, Craig Block wrote:
> > >>Craig Block wrote:
> > >>
> > >>I'm having a problem with the 80-wire/40-wire cable detection
> 
> > Jeff Garzik wrote:
> > >
> > >If you signal a 40-wire cable too fast, you get trouble with a
> > >capital T.
> 
> Thanks everyone for graciously replying to my negative email.  I was
> pretty irritated when I found I could not disable the downgrade.  
> 
> That's fine if the driver nags about the cable, but it should up to the
> user to deal with it.  And, like any nag, it should be possible to shut
> if off.

"idex=ata66" parameter used to only override host side cable detection
but to be able to deal with short 40-wire cables it now also overrides
device side cable detection (patches were merged in Linus' tree,
2.6.23-rc1 will have them).

> As it stands, I will have to run these drives at ATA33.  My only
> recourse is to hack the driver and disable the check.  With *me*
> hacking on the code, I really run the risk of damaging my data.
> 
> Patches anyone?

Please send the output of hdparm --Istdout for this drive.

"idex=ata66" or CONFIG_IDEDMA_IVB=y should also help but we really would
like to detect and workaround such issues automatically, without the need
for user headaches. ;)

Thanks,
Bart