LILO is one of the choice you have for a bootloader for linux. I found a list of error codes that i thought would be interesting to look at. credits to http://www.cornelinux.de/linux/lilo.html
LILO stage error:
(nothing) No part of LILO has been loaded. LILO either isn't installed or the partition on which its boot sector is located isn't active.
L ... The first stage boot loader has been loaded and started, but it can't load the second stage boot loader. The two-digit error codes indicate the type of problem. (See also section "Disk error codes".) This condition usually indicates a media failure or a geometry mismatch (e.g. bad disk parameters, see section "Disk geometry").
LI The first stage boot loader was able to load the second stage boot loader, but has failed to execute it. This can either be caused by a geometry mismatch or by moving /boot/boot.b without running the map installer.
LIL The second stage boot loader has been started, but it can't load the descriptor table from the map file. This is typically caused by a media failure or by a geometry mismatch.
LIL? The second stage boot loader has been loaded at an incorrect address. This is typically caused by a subtle geometry mismatch or by moving /boot/boot.b without running the map installer.
LIL- The descriptor table is corrupt. This can either be caused by a geometry mismatch or by moving /boot/map without running the map installer.
LILO All parts of LILO have been successfully loaded.
If you get an error that contains numbers, this means that the BIOS have encountered and error (the numbers representing disk errors) and you can sort them out with the following list:
0x00 "Internal error". This code is generated by the sector read routine of the LILO boot loader whenever an internal inconsistency is detected. This might be caused by corrupt files. Try re-building the map file. Another possible cause for this error are attempts to access cylinders beyond 1024 while using the LINEAR option. See section "BIOS restrictions" for more details and for how to solve the problem.
0x01 "Illegal command". This shouldn't happen, but if it does, it may indicate an attempt to access a disk which is not supported by the BIOS. See also "Warning: BIOS drive 0x may not be accessible" in section "Warnings".
0x02 "Address mark not found". This usually indicates a media problem. Try again several times.
0x03 "Write-protected disk". This should only occur on write operations.
0x04 "Sector not found". This typically indicates a geometry mismatch. If you're booting a raw-written disk image, verify whether it was created for disks with the same geometry as the one you're using. If you're booting from a SCSI disk or a large IDE disk, you should check, whether LILO has obtained correct geometry data from the kernel or whether the geometry definition corresponds to the real disk geometry. (See section "Disk geometry".) Removing COMPACT may help too. So may adding LINEAR.
0x06 "Change line active". This should be a transient error. Try booting a second time.
0x07 "Invalid initialization". The BIOS failed to properly initialize the disk controller. You should control the BIOS setup parameters. A warm boot might help too.
0x08 "DMA overrun". This shouldn't happen. Try booting again.
0x09 "DMA attempt across 64k boundary". This shouldn't happen. Try omitting the COMPACT option.
0x0C "Invalid media". This shouldn't happen and might be caused by a media error. Try booting again.
0x10 "CRC error". A media error has been detected. Try booting several times, running the map installer a second time (to put the map file at some other physical location or to write "good data" over the bad spot), mapping out the bad sectors/tracks and, if all else fails, replacing the media.
0x11 "ECC correction successful". A read error occurred, but was corrected. LILO does not recognize this condition and aborts the load process anyway. A second load attempt should succeed.
0x20 "Controller error". This shouldn't happen.
0x40 "Seek failure". This might be a media problem. Try booting again.
0x80 "Disk timeout". The disk or the drive isn't ready. Either the media is bad or the disk isn't spinning. If you're booting from a floppy, you might not have closed the drive door. Otherwise, trying to boot again might help.
0xBB "BIOS error". This shouldn't happen. Try booting again. If the problem persists, removing the COMPACT option or adding/removing LINEAR might help.
If the error occurred during a write operation, the error code (two hex digits) is prefixed with a "W". Although write errors don't affect the boot process, they might indicate a severe problem, because they usually imply that LILO has tried to write to an invalid location. If spurious write errors occur on a system, it might be a good idea to configure LILO to run read-only (see section "Build-time configuration").
Generally, invalid geometry and attempts to use more than two disks without a very modern BIOS may yield misleading error codes. Please check carefully if /sbin/lilo doesn't emit any warnings. Then try using the LINEAR option (see section "Global options").