Re: Bug#338089: New aic7xxx driver fails spectacularly on 2940UW

[James Bottomley <James.Bottomley@SteelEye.com>]

On Sun, 2005-11-13 at 13:03 -0500, Graham Knap wrote:
> Doug Ledford <dledford@redhat.com> wrote:
> > You already said it didn't help with the problem, 
> 
> I meant that I don't think I successfully disabled DV, because the boot
> messages were *identical*, except for the line where the kernel shows
> the "Kernel command line".
> 
> I had added this argument at the end of the line:  aic7xxx=dv:{0}
> 
> I've re-read "aic7xxx.txt" and I'm not sure what I'm doing wrong. If
> you can tell me how to disable DV, I'd be happy to give it a try.

aic7xxx.txt is out of date.  The aic7xxx (and 79xx) drivers use the
generic domain validation code now rather than the old aic specific ones
(which is what the dv:{0} option is referring to).  If you try the code
in the prior email, I think that will disable the piece of DV that's
causing the problem.

If the test code succeeds, the problem is pretty nasty:  Apparently the
device claims DT support but in fact rejects DT in the negotiation.  We
use DT support to begin the check for an echo buffer, which starts with
READ_BUFFERS for the descriptor.  Apparently this device returns a valid
descriptor with a reasonable echo buffer size and then promptly throws a
wobbly when we try to use it.

James