Re: [Xen-devel] Mini-OS and serial output

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Am Montag, 9. Juli 2007 schrieb Keir Fraser:
> On 9/7/07 09:42, "Michael Frey" <lists@xxxxxxxxx> wrote:
> > I've built Xen with "make debug=y" and added some necessary lines to
> > grub.conf. Furthermore I've connected a second workstation via serial to
> > the Xen workstation and I got the the output from the boot process and
> > various other things. I start the mini-os domain and I get no
> > "Bootstrapping .." line as defined in extras/mini-os/kernel.c
> >
> > So I have a debug build of Xen (I suggest) and I get some output via
> > serial console, but the mini-os serial output doesn't seem to work.
> > Suggestions?
>
> Add some tracing to the hypercall inside Xen, conditional on calling domain
> id being != 0, to confirm that the hypercall is actually being invoked, and
> to discover why the messages are being dropped.

You must build Xen with the VERBOSE flag switched on. 
This is done by make verbose=y (see Rules.mk)
You may have a look at xen/drivers/char/console.c
In function do_console_io() you can see, that per default the hypervisor 
console calls from domU's are ignored.

Dietmar.

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