RE: [Xen-users] using HYPERVISOR_console_io

["Petersson, Mats" <mats.petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Michael Levenhagen
> Sent: 24 October 2005 17:21
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] using HYPERVISOR_console_io
> 
> I just setup a serial line connecting my xen development 
> machine to my workstation. I use minicom on my workstation to 
> connect to the serial line. I see nothing on it when I boot 
> xen. I know that the connection works because when I boot my 
> xen machine into linux I can start minicom on it and see the 
> characters in minicom on my workstation.
> 
> What output can be directed to the serial port?
> What configuration am I missing?
> Is there any documentation on xen boot options?

Probably a basic question, but: 
com1=115200,8n1 console=vga,com1 sync_console 
Is what's on my command line for Xen. It works for me... 

On the Dom0 line, I've got "console=ttyS0"

sync_console is a useful thing if you're debugging problems where the
system crashes in a triple-fault and thus the console output gets to the
buffer but isn't sent to the terminal program by the time the machine
reboots. 

--
Mats
> 
> thanks
> Mike
> 
> Ian Pratt wrote:
> 
> > 
> >
> >
> >  
> >
> >>I'm porting a kernel from 2.0.7 to 3.0 and need to do some 
> low level 
> >>debugging.
> >>
> >>It's unclear to me what need's to be done to get 
> HYPERVISOR_console_io 
> >>to work.
> >>I've compiled xen with debug=y. My simple kernel is as follows.
> >>
> >>void start_kernel( start_info_t *start_info ) {
> >>        char *message = "hello\n";
> >>
> >>        HYPERVISOR_console_io(CONSOLEIO_write,
> >>strlen(message), message); }
> >>
> >>I'm fairly confident that I'm entering start_kernel because I can 
> >>change the behavior by putting a while(1) after the HYPERVISOR call.
> >>
> >>Where should I see the output if things are working? I don't see 
> >>anything on the PC's monitor.
> >>    
> >>
> >
> >Have you got a serial console set up? It's pretty useful to have xen 
> >debug output interspersed with domain output when debugging, 
> plus the 
> >'xen magic keys' are useful too.
> > 
> >  
> >
> >>How do I view the boot messages for xen? IIRC I used xm under
> >>2.0.7 but I don't see any options with 3.0.
> >>    
> >>
> >
> >'xm dmesg' should also show you output.
> >
> >Ian
> >
> >
> >  
> >
> 
> 
> 
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> 
> 


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