Re: IDE bug in 2.4.2-ac12?

[Vojtech Pavlik <vojtech@suse.cz>]

On Tue, Mar 06, 2001 at 09:32:46PM +0000, Paul Bristow wrote:
> On Tuesday 06 March 2001 19:13, Konrad Stopsack wrote:
> > Hello guys,
> >
> > I hope you've read my posting "DMA problem with ZIP drive and VIA
> > VT82C598MVP / VT82C586B chip" (why does anybody answer?).
> > I now tried the 2.4.2-ac12 kernel including the latest VIA 82c586b driver
> > (version 3.21), but the effects were almost the same:
> > - just when the kernel tried to access to the hard disk during boot, DMA
> > errors were occured
> > - "hdparm /dev/hda" displayed 9 MB per second (and not 11 MB like without
> > ZIP) - /proc/ide/via reported 16 MB transfer rate (and not 33MB like
> > without ZIP drive)
> > - Kernel 2.4.2-ac12 reports a "ide-floppy: hdd: I/O error, pc = 5a, key = 
> > 5, asc = 24, ascq =  0" error, 2.4.2 doesn't
> >
> > My IDE configuration is:
> > /dev/hda: Hard disk  => Primary IDE controller
> > /dev/hdc CD-ROM  => Secondary IDE controller
> > /dev/hdd: ZIP           => Secondary IDE controller
> >
> > Could you please tell me whether it's a bug or a feature?
> 
> OK.  The ZIP drive can not handle uDMA, so it's normal for the secondary 
> controller to drop back.  In my opinion, the primary controller should stay 
> at uDMA speed, but it is PC hardware so it is perfectly possible there is 
> something cheap that locks them together.  I will bring up ac-12 and check 
> the error message...

Actually I'm beginning to suspect the PSU here ... does removing the
CD-ROM (leaving just the HDD and the ZIP in) help? Does the ZIP cause
errors even when connected just to the power cable (and not the IDE
cable)?

-- 
Vojtech Pavlik
SuSE Labs