GRUB menu.lst - alternative groot directive

[Till Wimmer <news-dfn@substring.ch>]

Hello,

i'm wondering if there's a alternative "groot" directive similar to "altoptions"?

Background:

I'm running /boot on a software RAID-1

  md0 : active raid1 sda1[0] sdb1[1])

and i'd like to have a fallback menu item in menu.lst liek this:

  default         0
  fallback        1

  title           Debian GNU/Linux, kernel 2.6.26-2-686
  root            (hd0,0)
  kernel          /vmlinuz-2.6.26-2-686 root=/dev/mapper/lvmgroup-root ro quiet
  initrd          /initrd.img-2.6.26-2-686

  title           Debian GNU/Linux, kernel 2.6.26-2-686 (md0 fallback)
  root            (hd1,0)
  kernel          /vmlinuz-2.6.26-2-686 root=/dev/mapper/lvmgroup-root ro quiet
  initrd          /initrd.img-2.6.26-2-686

I can partly accomplish this by adding an altoption line:
  ## altoption boot targets option
  ## multiple altoptions lines are allowed
  ## e.g. altoptions=(extra menu suffix) extra boot options
  ##      altoptions=(single-user) single
  # altoptions=(md0 fallback) quiet

... but root then (GRUB root, not kernel root option) is always set to "(hd0,0)".


Is there any way to tell update-grub to adjust groot for alternative menu items?

Thanks
TW