[Grml] Boot by UUID or disk label

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Hi,

Grml wiki indicates that grml can use disk labels/UUIDs as root= option
for booting [1]. What's the correct syntax for that? 

[1] http://wiki.grml.org/doku.php?id=usb&DokuWiki=88eb0d5110993c6c4d0ca5992abee8fa

I searched hard and came up with the following, trying to boot my USB key:

 title		GRML on 1st HD
 root		(hd0,1)
 kernel		/boot/vmlinuz root=/dev/disk/by-uuid/b53f0a8b-deab-40b3-a84c-0779cb8b7772 ro 
 boot

 title		GRML on 1st HD
 root		(hd0,1)
 kernel		/boot/vmlinuz root=/dev/disk/by-label/grml.boot ro 
 boot

 title		GRML on 2nd HD
 root		(hd1,1)
 kernel		/boot/vmlinuz root=/dev/disk/by-uuid/b53f0a8b-deab-40b3-a84c-0779cb8b7772 ro 
 boot

But all gave me root filesystem not found error (grub boot normally, just 
can't find root fs).

I'm sure the uuid and disk label are correct. What else could be the problem? 

thanks

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