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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Apr 19, 2010 at 04:56:48PM +0200, Matej Zary wrote:
> 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


Try this instead:
kernel       /boot/xen-4.0.gz dom0_mem=512M loglvl=all guest_loglvl=all 
com1=115200,8n1,0xec00,18 console=com1

You can't have spaces between the parameters.
dom0 kernel line looks OK.

If that doesn't work then try specifying 0 as the IRQ (instead of 18).
Also.. hmm.. I wonder if the irq should be in hex or in decimal.. 

-- Pasi

> 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
> 
> 
> 
> 
> 
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