Re: [Xen-users] Serial console - Xen 4.0 - debugging pv_ops 2.6.31 dom0 kernel

[Gerry Reno <greno@xxxxxxxxxxx>]

Matej Zary wrote:
> Well, it seems, problem is the IO ports Kouwell PCI card - 01:0a.0 
> Communication controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 
> 01).
>
> COM ports work in standard Lenny kernel like charm, but when I remove these modules, they caese to work - so it seems they need special driver to work - so I assume that's the reason they don't work during xen boot process (or I'm wrong? :) ). 
>
> lsmod 
>
> parport_serial         11264  0
> parport_pc             31016  1 parport_serial
> parport                41776  1 parport_pc
>
>
> Any ideas? (or advice on proven PCI card with COM ports that are usable for 
> monitoring xen boot process)?
>
>
> Regards
>
> Matej
>
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Matej Zary
> Sent: Monday, April 19, 2010 4:57 PM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Serial console - Xen 4.0 - debugging pv_ops 2.6.31 dom0 
> kernel
>
> Hello all,
>
> I compiled from source Xen 4.0 with the default 2.6.31.13 pv_ops dom0 kernel on barebone Debian Lenny installation. Problem is, this dom0 kernel won't boot. First complaining about ioapic, so I tried with noioapci, still no luck (the screen blackens during boot and computer reboots). :( So here comes serial console. This PC is older shady Asrock nForce 430 board with AMD Athlon X2 1,9 Ghz CPU => no onboard serial port. Therefore I added PCI card with i/o ports. 
>
> dmesg | grep tty
> [    0.004000] console [tty0] enabled
> [    0.923873] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> [    0.924008] 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> [    7.887891] 0000:01:0a.0: ttyS1 at I/O 0xec00 (irq = 18) is a 16550A
> [    7.887891] 0000:01:0a.0: ttyS2 at I/O 0xe480 (irq = 18) is a 16550A
>
>
> According to http://wiki.xensource.com/xenwiki/XenSerialConsole I used usb->com cable on my laptop and tried the link test with minicom on both sides - chatting worked flawlessly (using /dev/ttyS1 on "server" side). 
>
> Problem is, I'm not able configure boot options for Xen to work with this 
> serial port. My grub menu.lst (one from many experiments):
>
> title        Xen 4.0, Linux kernel 2.6.31.13 with serial console
> root         (hd0,0)
> kernel       /boot/xen-4.0.gz dom0_mem=512M loglvl=all guest_loglvl=all 
> com2=115200, 8n1, 0xec00, 18 console=com2
> module       /boot/vmlinuz-2.6.31.13 root=/dev/sda1 ro console=hvc0 
> earlyprintk=xen nomodeset
> module       /boot/initrd.img-2.6.31.13
>
> Tried many  variations, but still no luck getting the xen boot process on my 
> serial connected console.
>
> Any hints?
>
>
> Many thanks.
>
> Matej
>
>   
Marej,
   I am facing same problem as you.  Cannot get pv_ops dom0 kernel to 
boot on my hardware (AMD) and trying to get console output from MB w/o 
serial port.  I thought in 2.6.31 kernels there was support for USB 
console?  I had seen this somewhere but cannot find it now.  Not sure 
how USB console would be configured to other machine.  The only way I 
can think to do this is with a USB-RS232 dongle.
-Gerry


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