LILO (boot loader)
Standard LILO menu display.
|Developer(s)||Werner Almesberger (1992–1998), John Coffman (1999–2007), Joachim Wiedorn (since 2010)|
|Stable release||23.2 (9 April 2011)|
LILO (LInux LOader) is a boot loader for Linux and was the default boot loader for most Linux distributions in the years after the popularity of loadlin. Today, most distributions use GRUB as the default boot loader.
LILO does not depend on a specific file system, and can boot an operating system (e.g., Linux kernel images) from floppy disks and hard disks. One of up to sixteen different images can be selected at boot time. Various parameters, such as the root device, can be set independently for each kernel. LILO can be placed in the master boot record (MBR) or the boot sector of a partition. In the latter case, the MBR must contain code to load LILO.
At system start, only the BIOS drivers are available for LILO to access hard disks. For this reason, a very old BIOS access area is limited to cylinders 0 to 1023 of the first two hard disks. For a later BIOS, LILO can use 32-bit "logical block addressing" (LBA) to access the entire capacity of the hard disks the BIOS has access to.
LILO files 
The lilo.conf file is typically located at /etc/lilo.conf. Within lilo.conf there are typically two section types. The first section, which defines the global options, contains parameters which specify boot location attributes. The second section(s) contain parameters associated with the operating system images to be loaded. The section type can be repeated for up to 16 different boot selections.
Remember to run the /sbin/lilo command after editing the /etc/lilo.conf file so that your changes take effect.
An example for /etc/lilo.conf:
large-memory lba32 boot=/dev/hda install=menu map=/boot/map prompt default=Linux image=/boot/vmlinuz-2.6.26 label="Linux" root=/dev/hda1 append="" read-only optional other=/dev/hda3 label="FreeBSD"
Note: Here LILO offers after correct installation a menu with Linux and FreeBSD.
Master boot record 
LILO can write a Master Boot Record on a device:
When LILO loads itself it displays the word “LILO”. Each letter is printed before or after some specific action. If LILO fails at some point, the letters printed so far can be used to identify the problem.
- 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. The boot media is incorrect or faulty.
- 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. This condition usually indicates a media failure or bad disk parameters in the BIOS.
- The first stage boot loader was able to load the second stage boot loader, but has failed to execute it. This can be caused by bad disk parameters in the BIOS.
- 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 bad disk parameters in the BIOS.
- The second stage boot loader has been loaded at an incorrect address. This is typically caused by bad disk parameters in the BIOS.
- The descriptor table is corrupt. This can be caused by bad disk parameters in the BIOS.
- All parts of LILO have been successfully loaded.
Error codes 
e.g.: L 01 01 01, L 07 07 07 etc..
|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.|
|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. Definitely check to see if the disk is seen by the BIOS first (and that the BIOS detail is complete).|
|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. Removing COMPACT may help too. So may adding LBA32 or 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. (Boot a rescue disc and rerun LILO.)|
|0x08||DMA overrun||This shouldn't happen. Try booting again.|
|0x09||DMA attempt across 64k boundary||This shouldn't happen, but may indicate a disk geometry mis-match. Try omitting the COMPACT option. You may need to specify the disk geometry yourself.|
|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, then again, none of these errors should happen eh?|
|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.|
|0x99||Invalid Second Stage||Mismatch between drive and BIOS geometry, or a bad map file. Some evidence that LINEAR needs to be set on the disk (see LiloNotes)|
|0x9A||Can't Find Second Stage||Check to see if you have the correct device for boot, e.g. boot=/dev/hda1 when it should be in the MBR i.e. boot=/dev/hda.|
|0xBB||BIOS error||This shouldn't happen. Try booting again. If the problem persists, removing the COMPACT option or adding/removing LINEAR or LBA32 might help.|
|Stable release||3.14 / January 13, 2011|
See also 
- LILO installation instructions
- LILO mini-HOWTO
- LILO error messages
- LILO and GRUB: Boot Loaders Made Simple by Judith Myerson
- From Lilo to Grub
- Lilo tips from the Linux Kernel Howto
- Bonney, Laurence (2005-08-24). "Boot loader showdown: Getting to know LILO and GRUB: Contrast and compare these two contenders". IBM DeveloperWorks. Retrieved 2009-04-26.
- Linux Administration and Privileged Commands Manual –
- Linux File Formats Manual –