diff options
Diffstat (limited to 'sys/boot/i386/boot0/Makefile')
| -rw-r--r-- | sys/boot/i386/boot0/Makefile | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/sys/boot/i386/boot0/Makefile b/sys/boot/i386/boot0/Makefile index e02b102..4eb8435 100644 --- a/sys/boot/i386/boot0/Makefile +++ b/sys/boot/i386/boot0/Makefile @@ -6,11 +6,29 @@ BINMODE=${NOBINMODE} NO_MAN= SRCS= ${PROG}.S -# The default set of flags compiled into boot0. This enables update (writing -# the modified boot0 back to disk after running so that the selection made is -# saved), packet mode (detect and use the BIOS EDD extensions if we try to -# boot past the 1024 cylinder liimt), and booting from all valid slices. -BOOT_BOOT0_FLAGS?= 0x8f +# Additional options that you can specify with make OPTS="..." +# (these only apply to boot0.S) +# +# -DSIO do I/O using COM1: +# -DPXE fallback to INT18/PXE with F6 +# -DCHECK_DRIVE enable checking drive number +# -DONLY_F_KEYS accept only Fx keys in console +# -DTEST print drive number on entry +# +CFLAGS += ${OPTS} + +# Flags used in the boot0.S code: +# 0x0f all valid partitions enabled. +# 0x80 'packet', use BIOS EDD (LBA) extensions instead of CHS +# to read from disk. boot0.S does not check that the extensions +# are supported, but all modern BIOSes should have them. +# 0x40 'noupdate', disable writing boot0 back to disk so that +# the current selection is not preserved across reboots. +# 0x20 'setdrv', override the drive number supplied by the bios +# with the one in the boot sector. + +# Default boot flags: +BOOT_BOOT0_FLAGS?= 0xcf # The number of timer ticks to wait for a keypress before assuming the default # selection. Since there are 18.2 ticks per second, the default value of |
