NOVA, NUL, snapshotting

Julian Stecklina jsteckli at
Mon Oct 14 15:22:53 CEST 2013

On 10/14/2013 12:45 PM, Sartakov A. Vasily wrote:
> Hi there. 
> I want to start NOVA/NUL without vga in qemu. 
> I've added -novga, have removed vga:0x03c0 (and kbc, keyb) in PC_PS2 alias
> I use hostserial in sigma0.nul config string
> and bzImage-js has "console=ttyS0" and "console=tty" 
> I do not have a Linux login message after booting if Linux, but I have all messages related to boot. 

This indicates that your setup wrt to NOVA/NUL is correct, but your
virtual Linux is not spawning a getty on its serial device.

You need a line such as:
T0:23:respawn:/sbin/getty -w -L ttyS0 115200 vt100
in /etc/inittab to get a login prompt on the serial console.

You can extract, modify and recreate your initrd with cpio. For details
check for example this page:

If the bzImage has the initramfs image already embedded, it should work
to use an initramfs with only the updated /etc/inittab file.


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