Re: [Xen-users] using HYPERVISOR_console_io

["Michael Levenhagen" <mjleven@xxxxxxxxxx>]

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?

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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