1PROG?= boot0 2STRIP= 3BINMODE=${NOBINMODE} 4SRCS= ${PROG}.S 5 6# Additional options that you can specify with make OPTS="..." 7# (these only apply to boot0.S) 8# 9# -DVOLUME_SERIAL support volume serial number (NT, XP, Vista) 10# -DSIO do I/O using COM1: 11# -DPXE fallback to INT18/PXE with F6 12# -DCHECK_DRIVE enable checking drive number 13# -DONLY_F_KEYS accept only Fx keys in console 14# -DTEST print drive number on entry 15# 16OPTS ?= -DVOLUME_SERIAL -DPXE 17CFLAGS += ${OPTS} 18 19# Flags used in the boot0.S code: 20# 0x0f all valid partitions enabled. 21# 0x80 'packet', use BIOS EDD (LBA) extensions instead of CHS 22# to read from disk. boot0.S does not check that the extensions 23# are supported, but all modern BIOSes should have them. 24# 0x40 'noupdate', disable writing boot0 back to disk so that 25# the current selection is not preserved across reboots. 26# 0x20 'setdrv', override the drive number supplied by the bios 27# with the one in the boot sector. 28 29# Default boot flags: 30BOOT_BOOT0_FLAGS?= 0x8f 31 32# The number of timer ticks to wait for a keypress before assuming the default 33# selection. Since there are 18.2 ticks per second, the default value of 34# 0xb6 (182d) corresponds to 10 seconds. 35BOOT_BOOT0_TICKS?= 0xb6 36 37# The BIOS loads boot0 to the hardcoded address 0x7c00. boot0 copies 38# itself to this alternate base address before continuing execution so 39# that next level boot blocks can be loaded at the 0x7c00 address they 40# expect. 41ORG= 0x600 42 43# Comm settings for boot0sio. 44# 45# boot0sio uses BIOS INT $0x14 for serial ports, we can only support these 46# baudrates due to INT14's limited interface. In addition, if 47# BOOT_BOOT0_COMCONSOLE_SPEED=0, then the baud rate and frame format will remain 48# unchanged. Some BIOSes initialize the serial ports to 115200, and this may 49# allow boot0sio access at that rate if so. 50# 51# Bit(s) Description 52# 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps) 53# 4-3 parity (00 or 10 = none, 01 = odd, 11 = even) 54# 2 stop bits (set = 2, clear = 1) 55# 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8) 56.if !defined(BOOT_BOOT0_COMCONSOLE_SPEED) 57BOOT_COMCONSOLE_SPEED?= 9600 # BIOS interfaces do not support higher rates. 58.if ${BOOT_COMCONSOLE_SPEED} == 9600 59BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 60.elif ${BOOT_COMCONSOLE_SPEED} == 4800 61BOOT_BOOT0_COMCONSOLE_SPEED= "6 << 5 + 3" 62.elif ${BOOT_COMCONSOLE_SPEED} == 2400 63BOOT_BOOT0_COMCONSOLE_SPEED= "5 << 5 + 3" 64.elif ${BOOT_COMCONSOLE_SPEED} == 1200 65BOOT_BOOT0_COMCONSOLE_SPEED= "4 << 5 + 3" 66.elif ${BOOT_COMCONSOLE_SPEED} == 600 67BOOT_BOOT0_COMCONSOLE_SPEED= "3 << 5 + 3" 68.elif ${BOOT_COMCONSOLE_SPEED} == 300 69BOOT_BOOT0_COMCONSOLE_SPEED= "2 << 5 + 3" 70.elif ${BOOT_COMCONSOLE_SPEED} == 150 71BOOT_BOOT0_COMCONSOLE_SPEED= "1 << 5 + 3" 72.elif ${BOOT_COMCONSOLE_SPEED} == 110 73BOOT_BOOT0_COMCONSOLE_SPEED= "0 << 5 + 3" 74.else 75BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 76.endif 77.endif 78 79CFLAGS+=-DFLAGS=${BOOT_BOOT0_FLAGS} \ 80 -DTICKS=${BOOT_BOOT0_TICKS} \ 81 -DCOMSPEED=${BOOT_BOOT0_COMCONSOLE_SPEED} 82 83LDFLAGS+=${LDFLAGS_BIN} 84 85.include <bsd.prog.mk> 86