1 2PROG?= boot0 3STRIP= 4BINMODE=${NOBINMODE} 5SRCS= ${PROG}.S 6 7# Additional options that you can specify with make OPTS="..." 8# (these only apply to boot0.S) 9# 10# -DVOLUME_SERIAL support volume serial number (NT, XP, Vista) 11# -DSIO do I/O using COM1: 12# -DPXE fallback to INT18/PXE with F6 13# -DCHECK_DRIVE enable checking drive number 14# -DONLY_F_KEYS accept only Fx keys in console 15# -DTEST print drive number on entry 16# 17OPTS ?= -DVOLUME_SERIAL -DPXE 18CFLAGS += ${OPTS} 19 20# Flags used in the boot0.S code: 21# 0x0f all valid partitions enabled. 22# 0x80 'packet', use BIOS EDD (LBA) extensions instead of CHS 23# to read from disk. boot0.S does not check that the extensions 24# are supported, but all modern BIOSes should have them. 25# 0x40 'noupdate', disable writing boot0 back to disk so that 26# the current selection is not preserved across reboots. 27# 0x20 'setdrv', override the drive number supplied by the bios 28# with the one in the boot sector. 29 30# Default boot flags: 31BOOT_BOOT0_FLAGS?= 0x8f 32 33# The number of timer ticks to wait for a keypress before assuming the default 34# selection. Since there are 18.2 ticks per second, the default value of 35# 0xb6 (182d) corresponds to 10 seconds. 36BOOT_BOOT0_TICKS?= 0xb6 37 38# The BIOS loads boot0 to the hardcoded address 0x7c00. boot0 copies 39# itself to this alternate base address before continuing execution so 40# that next level boot blocks can be loaded at the 0x7c00 address they 41# expect. 42ORG= 0x600 43 44# Comm settings for boot0sio. 45# 46# boot0sio uses BIOS INT $0x14 for serial ports, we can only support these 47# baudrates due to INT14's limited interface. In addition, if 48# BOOT_BOOT0_COMCONSOLE_SPEED=0, then the baud rate and frame format will remain 49# unchanged. Some BIOSes initialize the serial ports to 115200, and this may 50# allow boot0sio access at that rate if so. 51# 52# Bit(s) Description 53# 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps) 54# 4-3 parity (00 or 10 = none, 01 = odd, 11 = even) 55# 2 stop bits (set = 2, clear = 1) 56# 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8) 57.if !defined(BOOT_BOOT0_COMCONSOLE_SPEED) 58BOOT_COMCONSOLE_SPEED?= 9600 # BIOS interfaces do not support higher rates. 59.if ${BOOT_COMCONSOLE_SPEED} == 9600 60BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 61.elif ${BOOT_COMCONSOLE_SPEED} == 4800 62BOOT_BOOT0_COMCONSOLE_SPEED= "6 << 5 + 3" 63.elif ${BOOT_COMCONSOLE_SPEED} == 2400 64BOOT_BOOT0_COMCONSOLE_SPEED= "5 << 5 + 3" 65.elif ${BOOT_COMCONSOLE_SPEED} == 1200 66BOOT_BOOT0_COMCONSOLE_SPEED= "4 << 5 + 3" 67.elif ${BOOT_COMCONSOLE_SPEED} == 600 68BOOT_BOOT0_COMCONSOLE_SPEED= "3 << 5 + 3" 69.elif ${BOOT_COMCONSOLE_SPEED} == 300 70BOOT_BOOT0_COMCONSOLE_SPEED= "2 << 5 + 3" 71.elif ${BOOT_COMCONSOLE_SPEED} == 150 72BOOT_BOOT0_COMCONSOLE_SPEED= "1 << 5 + 3" 73.elif ${BOOT_COMCONSOLE_SPEED} == 110 74BOOT_BOOT0_COMCONSOLE_SPEED= "0 << 5 + 3" 75.else 76BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 77.endif 78.endif 79 80CFLAGS+=-DFLAGS=${BOOT_BOOT0_FLAGS} \ 81 -DTICKS=${BOOT_BOOT0_TICKS} \ 82 -DCOMSPEED=${BOOT_BOOT0_COMCONSOLE_SPEED} 83 84LDFLAGS+=${LDFLAGS_BIN} 85 86.include <bsd.prog.mk> 87