I've been using grub-legacy to boot grub via the bootrecord of an extended partition, since having a multiboot setup where all other primary partitions, including the mbr, are dedicated otherwise and I need the bootrecord of grub on a "primary" partition to be able to use it with the somewhat weird setup I've got (one button boots the mbr, another button boots the grub-associated bootrecord)
In grub legacy it was a simple matter of specifying to install to (hd0,3) (or sda4). But in the new grub2 this no longer works and just gives "grub-setup: error: no such partition" or "Invalid device `/dev/sda4'".
I've tried grub-setup with --force but no luck. Is there any way to use the grub tools to do this, and if not, are there any way to do it in a more manual fashion and create the bootrecord image correctly and then simply dd the image onto sda4?
This is the fdisk output, goal is to have the "mbr" (br) on sda4 boot grub files from sda6
Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000080
Device Boot Start End Blocks Id System /dev/sda1 1 2550 20482843+ c7 Syrinx /dev/sda2 2551 6375 30720000 7 HPFS/NTFS
/dev/sda3 6375 10836 35837098 7 HPFS/NTFS /dev/sda4 * 10837 38913 225528502+ f W95 Ext'd (LBA) /dev/sda5 10837 35726 199928893+ 7 HPFS/NTFS /dev/sda6 35727 38427 21695751 83 Linux
/dev/sda7 38428 38913 3903763+ 82 Linux swap / Solaris