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# $FreeBSD$
PROG= boot0
NOMAN=
STRIP=
BINDIR?= /boot
BINMODE= 444
M4?= m4
# 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?= 0xf
# 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
# 0xb6 (182d) corresponds to 10 seconds.
BOOT_BOOT0_TICKS?= 0xb6
# The base address that we the boot0 code to to run it. Don't change this
# unless you are glutton for punishment.
BOOT_BOOT0_ORG?= 0x600
boot0: boot0.o
.if ${OBJFORMAT} == aout
${LD} -N -s -T ${BOOT_BOOT0_ORG} -o boot0.out boot0.o
dd if=boot0.out of=${.TARGET} ibs=32 skip=1
.else
${LD} -N -e start -Ttext ${BOOT_BOOT0_ORG} -o boot0.out boot0.o
objcopy -S -O binary boot0.out ${.TARGET}
.endif
boot0.o: boot0.s
${AS} ${AFLAGS} --defsym FLAGS=${BOOT_BOOT0_FLAGS} \
--defsym TICKS=${BOOT_BOOT0_TICKS} ${.IMPSRC} -o ${.TARGET}
CLEANFILES+= boot0.out boot0.o
.include <bsd.prog.mk>
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