Sorry my stupid mistake - I was running uml as a user who didn't have 
privileges on /dev/sda5. It works fine if I run as root.

andy

andy baxter wrote:
> I've had a go at getting UML running off a partition on the host system.
> What I've done is:
>
> - prepare it as an ext3 filesystem.
> - mount it and debootstrap a debian base system into it.
> - checked it works when you chroot to it.
> - install the user-mode-linux debian package.
> - run:
>
> $ linux.uml mem=128M udb0=/dev/sda5 rootflags=rw
> (also tried udba=/dev/sda5 root=/dev/sda5)
>
> I keep getting the error:
> VFS: cannot open root device "98:0" or unknown-block(98,0)
> (There is a longer error log than this but there's a lot and it's
> awkward to copy it from the machine I'm setting up on)
>
> can anyone help with this?
>
> cheers,
>
> andy
>
> Diego Ramos V. wrote:
>   
>> Yes, It's possible, I'm going to resend a mail which was sent for a 
>> great friend Benedict Verheyen, follow the instructions and it works out,
>>
>> - make a new directory for instance: *mkdir /mnt/new*
>> - mount the filesystem image on new directory *mount -o loop  
>> filesystem_image /mnt/new
>> - *Now you can copy any file into fileystem  *cp apache /mnt/new/home
>> - *umount the filesystem* image
>> - *run UML and install apache or any software, don't forget dependencies
>> -
>> Good Luck
>>
>> Diego R.
>>     
>
>
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