[Qemu-devel] redirecting output from qemu window / busybox setup howto

[Qemu-devel] redirecting output from qemu window / busybox setup howto

[Peter Teoh]

My kernel crashed currently under qemu, but i have no way to
redirecting the output to a file or something like that.

The options available to output via serial/tcp/udp port is all very
confusing here:

http://bellard.org/qemu/qemu-doc.html

I tried  "-serial tcp::4444,server", but after connecting using nc or
telnet from another screen, the dmesg output from the startup is not
redirected there, why?

my current command line is as follows:

qemu -hda debian.cow -m 384 -localtime -cdrom /dev/cdrom -kernel
/boot/vmlinuz-2.6.26-rc5 -initrd /boot/initrd-2.6.26-rc5-1.img -append
root="/dev/nfs nfsroot=10.10.1.157:/mnt/hd1/download/busybox/_install/
rw ip=dhcp" -net nic,vlan=0 -net
tap,vlan=0,ifname=tap0,script=./qemu-ifup

Does anybody have a short howto on setting up qemu with busybox as the
guest rootfs?


-- 
Regards,
Peter Teoh

Re: [Qemu-devel] redirecting output from qemu window / busybox setup howto

[Thiemo Seufer]

Peter Teoh wrote:
> My kernel crashed currently under qemu, but i have no way to
> redirecting the output to a file or something like that.
> 
> The options available to output via serial/tcp/udp port is all very
> confusing here:
> 
> http://bellard.org/qemu/qemu-doc.html
> 
> I tried  "-serial tcp::4444,server", but after connecting using nc or
> telnet from another screen, the dmesg output from the startup is not
> redirected there, why?
> 
> my current command line is as follows:
> 
> qemu -hda debian.cow -m 384 -localtime -cdrom /dev/cdrom -kernel
> /boot/vmlinuz-2.6.26-rc5 -initrd /boot/initrd-2.6.26-rc5-1.img -append
> root="/dev/nfs nfsroot=10.10.1.157:/mnt/hd1/download/busybox/_install/
> rw ip=dhcp" -net nic,vlan=0 -net
> tap,vlan=0,ifname=tap0,script=./qemu-ifup

I figure you missed to -append "console=ttyS0".


Thiemo