FAT16 (11+51) except when booting from FAT{12,16,32}, which needs FAT32 (11+79).
We still reserve the BPB for non-bootxx_msdos PBR bootblocks because
they may be installed as a floppy boot record (and those need a BPB).
Remove some redundant wording in an error messsage, saving 6 bytes.
i386-MD installboot.
They haven't been enabled for a while, keeping them here is just
confusing, and they're still going to be in the CVS repo attic...
<sys/bootblock.h>:
* Added definitions for the Master Boot Record (MBR) used by
a variety of systems (primarily i386), including the format
of the BIOS Parameter Block (BPB).
This information was cribbed from a variety of sources
including <sys/disklabel_mbr.h> which this is a superset of.
As part of this, some data structure elements and #defines
were renamed to be more "namespace friendly" and consistent
with other bootblocks and MBR documentation.
Update all uses of the old names to the new names.
<sys/disklabel_mbr.h>:
* Deprecated in favor of <sys/bootblock.h> (the latter is more
"host tool" friendly).
amd64 & i386:
* Renamed /usr/mdec/bootxx_dosfs to /usr/mdec/bootxx_msdos, to
be consistent with the naming convention of the msdosfs tools.
* Removed /usr/mdec/bootxx_ufs, as it's equivalent to bootxx_ffsv1
and it's confusing to have two functionally equivalent bootblocks,
especially given that "ufs" has multiple meanings (it could be
a synonym for "ffs", or the group of ffs/lfs/ext2fs file systems).
* Rework pbr.S (the first sector of bootxx_*):
+ Ensure that BPB (bytes 11..89) and the partition table
(bytes 446..509) do not contain code.
+ Add support for booting from FAT partitions if BOOT_FROM_FAT
is defined. (Only set for bootxx_msdos).
+ Remove "dummy" partition 3; if people want to installboot(8)
these to the start of the disk they can use fdisk(8) to
create a real MBR partition table...
+ Compile with TERSE_ERROR so it fits because of the above.
Whilst this is less user friendly, I feel it's important
to have a valid partition table and BPB in the MBR/PBR.
* Renamed /usr/mdec/biosboot to /usr/mdec/boot, to be consistent
with other platforms.
* Enable SUPPORT_DOSFS in /usr/mdec/boot (stage2), so that
we can boot off FAT partitions.
* Crank version of /usr/mdec/boot to 3.1, and fix some of the other
entries in the version file.
installboot(8) (i386):
* Read the existing MBR of the filesystem and retain the BIOS
Parameter Block (BPB) in bytes 11..89 and the MBR partition
table in bytes 446..509. (Previously installboot(8) would
trash those two sections of the MBR.)
mbrlabel(8):
* Use sys/lib/libkern/xlat_mbr_fstype.c instead of homegrown code
to map the MBR partition type to the NetBSD disklabel type.
Test built "make release" for i386, and new bootblocks verified to work
(even off FAT!).
destroy %dl (drive number) across the 'disk reset' command.
Preserve %dl across that call and all registers across the disk reads.
Reorder the code to remove some long conditional jumps to save space.
when loading from CDROM. Change so we don't care what %cs is.
Adjust code layout so that anyone who feels so inclinded can use this for
the mbr code. Note that mbr slot 0 overlays a data area that must be zero
when this is read from the pbr.
Added a mention of Wolfgang Solfrank - there are probably only comments left
from the much older mbr.S that he contributed.
(Wolfgang pointed out the mangled copyright, but doesn't object to the removal
of the Tools GmbH one.)
machine and x86 symlinks.
Include from right places.
Don't depend on LIBCRT0,etc.
Also for the bootxx programs, keep the ELF object during the build
process.
