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Date: Thu, 15 Jan 2009 10:27:12 +0300
From: Dmitriy Blinov <bda@mns.spb.ru>
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Subject: loop device doesn't supported by grub-install
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Hi all!
I tried to install grub2 on the image mounted via loop device 
(http://lists.gnu.org/archive/html/help-grub/2008-12/msg00009.html).
And it  turned out to be impossible with standard grub-install utility.


The reason is

grub-probe error: cannot find a GRUB drive for /dev/loop2


This error occurs then grub tries to define drive by device name parsing. See file: biosdisk.c function: get_os_disk.
Only scsi and ide disks supported by this function.


My problem resolved by using low-level utilities grub-mkimage and grub-setup.