RE: [Xen-devel] getting debug output out of hvmloader and qemu-dm

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

hvmloader's outb to port 0xe9 is intercepted by Xen, and Xen will prink the 
messages:
hvm_domain_initialise() ->  register_portio_handler(d, 0xe9, 1, hvm_print_line);

You can use a debug build Xen, or specify the "guest_loglvl=all" parameter in 
grub.conf for Xen to see the messages printked by hvm_print_line().

-- Dexuan


-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
Sent: 2008年7月3日 10:48
To: Kamala Narasimhan; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] getting debug output out of hvmloader and qemu-dm

> If it is the *DEBUG* preprocessor flag in vgabios that you enabled,
did
> you check xen message buffer (xm dmesg) or serial output?

'xm dmesg' doesn't show me anything... how might I look at the serial
output?

Looking at vgabios.c, the 'printf' function that is used for debugging
appears to write to port 0xe9, but I can't see that anything actually
reads that.

James


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