RE: [Xen-ia64-devel] RE: [PATCH] fixed serial console support

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

> > >    Hmm, what kind of box are you using that is setting the 
> > > irq to 9?  I
> > > don't have any boxes that use legacy serial interrupts, so 
> > there could
> > > be a problem there.  I believe Tristan had a patch that could make
> > > legacy interrupts work.  In the mean time, how about 
> > > explicitly setting
> > > irq = 0 before calling ns16550_init()?
> > 
> > It's an old rx2600 with a (PCI? AGP?) video card. It's set up
> > so that EFI console in/out goes both to serial and to video.
> > (as this makes it easier for me to install distros).  Maybe 9
> > is the video?
> > 
> > I'll try irq=0 when I have a chance... I'm currently testing
> > the latest xen-unstable.
> 
> Yep, forcing uart->irq to 0 in ns16550_init_postirq allows the
> boot to complete.

and then recompiling xenlinux with 8250 console = n allows
me to use ^A^A^A to get to the xen keyboard handler!  Cool!

Of course forcing irq to 0 in ns16550.c isn't going to be
very popular with the Cambridge folks :-)  I'll try it on
another machine Monday to see if the problem is unique to
my test machine.

Dan

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