Re: [Xen-users] using HYPERVISOR_console_io

["Michael Levenhagen" <mjleven@xxxxxxxxxx>]

That helps. Thanks.
I now have not only xen console output on the serial port but 
HYPERVISOR_console_io as well.
Mike

Petersson, Mats wrote:

>  
>
> > -----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
> > >
> > >
> > >
> > >
> > >      
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> >
> >    
>
>  

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