✎ edd-utils - Etherboot/gPXE Wiki

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====== BIOS EDD utilities ======

===== Overview =====

mkeddlinks is a simple utility which creates symlinks for the BIOS INT
13 devices present at the time the system booted.  For example:

  [root@dolphin /]# mkeddlinks
  [root@dolphin /]# ls -l /dev/bd*
  lrwxrwxrwx  1 root root 3 Sep  7 04:07 /dev/bda -> hda
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bda1 -> hda1
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bda2 -> hda2
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bda5 -> hda5
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bda6 -> hda6
  lrwxrwxrwx  1 root root 3 Sep  7 04:07 /dev/bdb -> hdc
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bdb1 -> hdc1
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bdb2 -> hdc2
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bdb5 -> hdc5
  lrwxrwxrwx  1 root root 4 Sep  7 04:07 /dev/bdb6 -> hdc6

It is designed to be incorporated into initial ramdisk images
(initrds) and to be run immediately before the root filesystem is
mounted.  The mount command can then use e.g. /dev/bda1 in order to
mount the first partition from whichever device the system booted
from, without needing to know where this device is currently attached.

===== Downloading =====

You can obtain edd-utils from https://sourceforge.net/project/showfiles.php?group_id=176708&package_id=203341

===== Internals =====

mkeddlinks uses the information provided by the "edd" module in 2.6
kernels via the /sys/firmware/edd directory.  It reads the
"mbr_signature" file of each INT 13 device found via this directory,
and matches it against the signature of all disks in the system (found
via /proc/partitions).  When a match is found, symlinks are created
for the disk device and all partitions within the disk.

===== Contact =====

Please ask any questions on the etherboot-discuss mailing list at <etherboot-discuss@lists.sourceforge.net>

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