reassign 475585 grub-common thanks With current sid I wasn't able to just get the /dev/md/N devices, but not the /dev/mdN too. So how did you get it working?
Attached is a patch which I sent to grub-devel too. Plaese reply, if it now works for you.
Index: util/getroot.c =================================================================== --- util/getroot.c (Revision 1753) +++ util/getroot.c (Arbeitskopie) @@ -460,6 +460,12 @@ memcpy (grub_dev, os_dev + 5, 7); grub_dev[7] = '\0'; } + else if (os_dev[7] == '/' && os_dev[8] >= '0' && os_dev[8] <= '9') + { + memcpy (grub_dev, os_dev + 5, 2); + memcpy (grub_dev + 2, os_dev + 8, 5); + grub_dev[7] = '\0'; + } else grub_util_error ("Unknown kind of RAID device `%s'", os_dev);