linux/Documentation/filesystems/bfs.txt
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   1BFS FILESYSTEM FOR LINUX
   2========================
   3
   4The BFS filesystem is used by SCO UnixWare OS for the /stand slice, which
   5usually contains the kernel image and a few other files required for the
   6boot process.
   7
   8In order to access /stand partition under Linux you obviously need to
   9know the partition number and the kernel must support UnixWare disk slices
  10(CONFIG_UNIXWARE_DISKLABEL config option). However BFS support does not
  11depend on having UnixWare disklabel support because one can also mount
  12BFS filesystem via loopback:
  13
  14# losetup /dev/loop0 stand.img
  15# mount -t bfs /dev/loop0 /mnt/stand
  16
  17where stand.img is a file containing the image of BFS filesystem. 
  18When you have finished using it and umounted you need to also deallocate
  19/dev/loop0 device by:
  20
  21# losetup -d /dev/loop0
  22
  23You can simplify mounting by just typing:
  24
  25# mount -t bfs -o loop stand.img /mnt/stand
  26
  27this will allocate the first available loopback device (and load loop.o 
  28kernel module if necessary) automatically. If the loopback driver is not
  29loaded automatically, make sure that you have compiled the module and
  30that modprobe is functioning. Beware that umount will not deallocate
  31/dev/loopN device if /etc/mtab file on your system is a symbolic link to
  32/proc/mounts. You will need to do it manually using "-d" switch of
  33losetup(8). Read losetup(8) manpage for more info.
  34
  35To create the BFS image under UnixWare you need to find out first which
  36slice contains it. The command prtvtoc(1M) is your friend:
  37
  38# prtvtoc /dev/rdsk/c0b0t0d0s0
  39
  40(assuming your root disk is on target=0, lun=0, bus=0, controller=0). Then you
  41look for the slice with tag "STAND", which is usually slice 10. With this
  42information you can use dd(1) to create the BFS image:
  43
  44# umount /stand
  45# dd if=/dev/rdsk/c0b0t0d0sa of=stand.img bs=512
  46
  47Just in case, you can verify that you have done the right thing by checking
  48the magic number:
  49
  50# od -Ad -tx4 stand.img | more
  51
  52The first 4 bytes should be 0x1badface.
  53
  54If you have any patches, questions or suggestions regarding this BFS
  55implementation please contact the author:
  56
  57Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
  58
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