Re: [uml-devel] Error running UML

[Blaisorblade <blaisorblade@yahoo.it>]

On Friday 30 September 2005 13:12, Etay Meiri wrote:
> Thanks for your response.
>
> I tried running it with a simple: ./vmlinux ubd0=root_fs.2005062201
> and now it says:
Well, the only option which *must* be dropped is root=/dev/ubd/0. The rest is 
harmless, and may help.

Note that if you use con=pty rather than con=xterm, you'll need to connect to 
the consoles manually and look for them. Plus /dev/pty* are deprecated, and 
some host kernel don't support them any more.

At least, using con=pts is more modern (it's supported on any recent kernel).
> [42949373.420000] Console initialized on /dev/tty0
> [42949373.420000] ubda: unknown partition table
> [42949373.420000] kjournald starting. Commit interval 5 seconds
> [42949373.420000] EXT3-fs: mounted filesystem with ordered data mode.
> [42949373.420000] VFS: Mounted root (ext3 filesystem) readonly.
> [42949373.420000] Warning: unable to open an initial console.
This warning, normally, is harmless.
> [42949373.420000] Kernel panic - not syncing: Attempted to kill init!

> Looks like it mounted the root file system but has a problem opening
> a console. Maybe I'm missing some console related option in the kernel
> config?
It's possible. I would first check also if init=/bin/sh makes it boot, to 
distinguish between fs problems and console problems. Also, remember to 
"mv /lib/tls /lib/tls.away" in the guest fs.

Due to a bug in kconfig, which wasn't fixed because the fix wasn't nice, if 
you do "make *config ARCH=um" on an empty tree it may pick as default values 
from /boot/config-`uname -r`. To avoid this, you need to move away 
your .config and do:

make defconfig ARCH=um
and only afterwards, depending on your taste for configuration tool,
make {menu,x,g}config ARCH=um
i.e. either make menuconfig ARCH=um or the other similar ones.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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