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List:       user-mode-linux-user
Subject:    Re: [uml-user] uml running problem
From:       Kunal Trivedi <ktrivedi () timesys ! com>
Date:       2001-03-26 22:50:17
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hi Jeff,
sorry for this, but i tried following to put /dev, /dev/console and
/bin/sh into my root_fs_debug

compile the kernel with loop option in block device
insmod loop,
mount -o loop -t ext2 root_fs_debug /mnt/root_fs_debug

i though, if i could mount root_fs_debug then, i can create dir. and
files inside it.but i could not do that, b'coz root_fs_debug is not a
'block device'. to mount it, i used -o loop option in mount, but it
failed.

can you please give any suggestion on it.

thanks
-kunal



Jeff Dike wrote:
> 
> ktrivedi@timesys.com said:
> > i am first time user of uml, and don't know much of the basic stuff.
> > i tried to create root file system, through following commands
> > dd if=/dev/zero of=root_fs_debug seek=100 count=1 bs=1M
> > mke2fs root_fs_debug and then run,
> > ./linux-2.4.2 ubd0=root_fs_debug
> 
> The root filesystem has to be more than an empty filesystem.  The three error
> messages you got are complaining about no /dev, /dev/console, and /sbin/init.
> 
> If you're going for the minimalist filesystem approach, put in a /dev (devfs
> will take care of the devices), and a /bin/sh, plus the dynamic libraries that
> the shell needs (and /lib/ld.so, I think) and boot UML with 'init=/bin/sh'.
> 
> That will get you a shell with the builtins working.
> 
>                                 Jeff

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