RE: [Xen-devel] serial console stopped working

[Rik van Riel <riel@xxxxxxxxxx>]

On Mon, 14 Feb 2005, Michael A Fetterman wrote:

> I've noticed this too. However, it's not reliable.
>
> I can boot the same xen/xenolinux images and have the console work,
> and subsequently have it not work.  And then work again.  I haven't
> figured out what causes it to change states yet.
When the serial console does not work, Xen spews out this line
when I type my first character at mgetty:

(XEN) Unexpected IRQ trap at vector 29.

If I type into the serial console while eth0 is being initialised,
I get an infinite (well, I stopped after 5 minutes) sequence of:

(XEN) Unexpected IRQ trap at vector 79.
(XEN) Unexpected IRQ trap at vector 79.
(XEN) Unexpected IRQ trap at vector 79.

I haven't yet run into the magical way to make it work ...

Note that I _can_ type letters into the serial console during
the earlier phases of the bootup process, eg. before udev is
started.

--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan


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