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| /freebsd-9.3-release/sys/boot/i386/boot0/ | ||
| H A D | boot0.S | diff 185562 Tue Dec 02 13:07:09 MST 2008 luigi This commits brings in a lot of documentation and some enhancement of the boot0.S code, with a number of compile-time selectable options, the most interesting one being the ability to select PXE booting. The code is completely compatible with the previous one, and with the boot0cfg program. Even the actual code is largely unmodified, with only minor rearrangements or fixes to make room for the new features. The behaviour of the standard build differs from the previous version in the following, minor things: + 'noupdate' is the default, which means the code does not write back the selection to disk. You can enable the feature at runtime with boot0cfg, or changing the flags in the Makefile. + a drive number of 0x00 (floppy, or USB in floppy emulation) is now accepted as valid. Previously, it was overridden with 0x80, meaning that the partition table coming from the media was used to access sectors on a possibly different media. You can revert to the previous mode building with -DCHECK_DRIVE, and you can always use the 'setdrv' option in boot0cfg + certain FAT or NTFS partitions are listed as WIN instead of DOS. + the 'bel' character on a bad selection is replaced by a '#' to make it clear that the system is not hang even if the machine does not have a speaker. This can be reverted back at compile time, or at runtime with an upcoming boot0cfg option. Additional features are available as compile time options, and may be become the default if deemed useful. In particular: + INT18/PXE boot (make -DPXE) This option enables booting through INT 18h (which on certain BIOSes can be hooked to PXE) by pressing F6. There is unfortunately no room to print the additional menu option. Also, to make room for the code, the 'Default: ' string is changed to 'Boot: ' + print current drive number (make -DTEST) Prints a line indicating the current drive number. This is useful to figure out what is going on for machines/bioses which remap drives in sometimes surprising ways. + disable numeric keys in console mode (make -DONLY_F_KEYS) Not really a significant option, but it is needed to make room for the -DTEST mode. + disable floppy support (make -DCHECK_DRIVE) Revert to the old behaviour of only accepting 0x80 and above as valid drive numbers. MFC after: 6 weeks |
| H A D | Makefile | diff 185562 Tue Dec 02 13:07:09 MST 2008 luigi This commits brings in a lot of documentation and some enhancement of the boot0.S code, with a number of compile-time selectable options, the most interesting one being the ability to select PXE booting. The code is completely compatible with the previous one, and with the boot0cfg program. Even the actual code is largely unmodified, with only minor rearrangements or fixes to make room for the new features. The behaviour of the standard build differs from the previous version in the following, minor things: + 'noupdate' is the default, which means the code does not write back the selection to disk. You can enable the feature at runtime with boot0cfg, or changing the flags in the Makefile. + a drive number of 0x00 (floppy, or USB in floppy emulation) is now accepted as valid. Previously, it was overridden with 0x80, meaning that the partition table coming from the media was used to access sectors on a possibly different media. You can revert to the previous mode building with -DCHECK_DRIVE, and you can always use the 'setdrv' option in boot0cfg + certain FAT or NTFS partitions are listed as WIN instead of DOS. + the 'bel' character on a bad selection is replaced by a '#' to make it clear that the system is not hang even if the machine does not have a speaker. This can be reverted back at compile time, or at runtime with an upcoming boot0cfg option. Additional features are available as compile time options, and may be become the default if deemed useful. In particular: + INT18/PXE boot (make -DPXE) This option enables booting through INT 18h (which on certain BIOSes can be hooked to PXE) by pressing F6. There is unfortunately no room to print the additional menu option. Also, to make room for the code, the 'Default: ' string is changed to 'Boot: ' + print current drive number (make -DTEST) Prints a line indicating the current drive number. This is useful to figure out what is going on for machines/bioses which remap drives in sometimes surprising ways. + disable numeric keys in console mode (make -DONLY_F_KEYS) Not really a significant option, but it is needed to make room for the -DTEST mode. + disable floppy support (make -DCHECK_DRIVE) Revert to the old behaviour of only accepting 0x80 and above as valid drive numbers. MFC after: 6 weeks |
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