2001-10-14  Thierry Laronde  <address@hidden>

	Raison d'être: 
	  - allow booting from CD via El Torito extensions.
	  - allow booting and using extended (unusual) floppy formats.
	
	General modifications:
	
	  - WARNING: COMPATIBILITY BROKEN!!! The compatibility
	  version number has reached 4.0, and, more importantly, the place
	  to search for it in stage1 has changed. YOU NEED COMPATIBLE
	  STAGE1, STAGE2 and GRUB SHELL!!!
	
	  - Identifying GRUB: in stage1, at offset 0x3 one finds the
	  following string:
	   "GRUB "<major><minor>'\0' /* exactly 8 bytes */
	   [This string is also used by the `message' routine; it now stops
	  displaying at the first non printable character]

	  - New variables: `grub_run_flags', `old_int1e', `bios_description',
	  array of disk structure `kdisks'.

	  - All flags are passed at installation time to
	  stage1_inst_flags, at running time to `grub_run_flags' --- "8 bits
	  flags should be enough for everybody" TL :-^
	
	  - The data organization in stage1[.S] has changed

	  - The values of numerous constants have been corrected [in
	  stage.h]. The value for BPB length was wrong for example.

	  - All the routines for probing floppies have been removed, and
	  replaced by the standard call, the number of floppies being
	  obtained via INT 11h, and being corrected in case of El Torito
	  floppy emulation [see stage2/common.c].

	  - A general disks array [kdisks] is created and filled at 
	  initialization time, devices being probed later only if they are
	  flagged REMOVABLE. The mbi structures have not been changed, and
	  the grub shell `disks' is kept at the moment -> unification have
	  to be done later.

	  - Names of magic numbers or constants have been changed
	  with the following principles:
	    if this is a memory location, the name is composed:
	       <LOCATION>_<DESCRIPTION>_OFFSET
	    if this is a value, the name is composed:
	       <STAGE1 | GRUB>_DESCRIPTION /* whether it's used by STAGE1
	  only or not */

	Details by file:
	  * stage1/stage1.S: major rewrite, add El Torito and customized
	  geometry support, remove floppy probe routines. DATA
	  organization changed, tons of comments added: please read
	  it! To be noted: initialization of `grub_run_flags'.
	  * stage1/stage1.h: corrections of names and values. Added
	  numerous constants, specially about BPB and stage1 installation
	  time flags, and GRUB run time flags. The BPB constants have been
	  moved from stage2/shared.h to stage1/stage1.h.
	  * stage2/start.S: modified to match the new data structure in
	  stage1.
	  * stage2/asm.S: 
	   - recopy stage1 important data: `grub_run_flags',
	  `bios_description', geometry of the booting drive (if CHS) in 
	  `boot_disk_geom', `old_int1e'
	   - removed function `get_diskinfo_floppy'
	   - added function `disk_changed'
	   - added code to retrieve the BIOS description of the machine
	     (mainly for the number of floppy drives [used in common.c])
	  * stage2/common.c: initialization of new structure kdisks,
	  probing _all_ the drives, including floppy drives.
	  * stage2/bios.c: 
	    - removed references to get_diskinfo_floppy
	    - modification of get_diskinfo to handle the new disks array
	  `kdisks'. 
	  * stage2/builtins.c:
	    - updated name of constants
	    - geometry_func: new options to write and set the geometry
	  * grub/grub/asmstub.c: initializations of global variables
	  unused: boot_disk_geom, bios_description, grub_run_flags.
	  * docs/grub.texi: advertised support for El Torito and unusual
	  floppy formats. Updated `geometry' function description.