1# $FreeBSD$ 2 3PROG?= boot0 4STRIP= 5BINMODE=${NOBINMODE} 6SRCS= ${PROG}.S 7 8# Additional options that you can specify with make OPTS="..." 9# (these only apply to boot0.S) 10# 11# -DVOLUME_SERIAL support volume serial number (NT, XP, Vista) 12# -DSIO do I/O using COM1: 13# -DPXE fallback to INT18/PXE with F6 14# -DCHECK_DRIVE enable checking drive number 15# -DONLY_F_KEYS accept only Fx keys in console 16# -DTEST print drive number on entry 17# 18OPTS ?= -DVOLUME_SERIAL -DPXE 19CFLAGS += ${OPTS} 20 21# Flags used in the boot0.S code: 22# 0x0f all valid partitions enabled. 23# 0x80 'packet', use BIOS EDD (LBA) extensions instead of CHS 24# to read from disk. boot0.S does not check that the extensions 25# are supported, but all modern BIOSes should have them. 26# 0x40 'noupdate', disable writing boot0 back to disk so that 27# the current selection is not preserved across reboots. 28# 0x20 'setdrv', override the drive number supplied by the bios 29# with the one in the boot sector. 30 31# Default boot flags: 32BOOT_BOOT0_FLAGS?= 0x8f 33 34# The number of timer ticks to wait for a keypress before assuming the default 35# selection. Since there are 18.2 ticks per second, the default value of 36# 0xb6 (182d) corresponds to 10 seconds. 37BOOT_BOOT0_TICKS?= 0xb6 38 39# The BIOS loads boot0 to the hardcoded address 0x7c00. boot0 copies 40# itself to this alternate base address before continuing execution so 41# that next level boot blocks can be loaded at the 0x7c00 address they 42# expect. 43ORG= 0x600 44 45# Comm settings for boot0sio. 46# 47# boot0sio uses BIOS INT $0x14 for serial ports, we can only support these 48# baudrates due to INT14's limited interface. In addition, if 49# BOOT_BOOT0_COMCONSOLE_SPEED=0, then the baud rate and frame format will remain 50# unchanged. Some BIOSes initialize the serial ports to 115200, and this may 51# allow boot0sio access at that rate if so. 52# 53# Bit(s) Description 54# 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps) 55# 4-3 parity (00 or 10 = none, 01 = odd, 11 = even) 56# 2 stop bits (set = 2, clear = 1) 57# 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8) 58.if !defined(BOOT_BOOT0_COMCONSOLE_SPEED) 59BOOT_COMCONSOLE_SPEED?= 9600 # BIOS interfaces do not support higher rates. 60.if ${BOOT_COMCONSOLE_SPEED} == 9600 61BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 62.elif ${BOOT_COMCONSOLE_SPEED} == 4800 63BOOT_BOOT0_COMCONSOLE_SPEED= "6 << 5 + 3" 64.elif ${BOOT_COMCONSOLE_SPEED} == 2400 65BOOT_BOOT0_COMCONSOLE_SPEED= "5 << 5 + 3" 66.elif ${BOOT_COMCONSOLE_SPEED} == 1200 67BOOT_BOOT0_COMCONSOLE_SPEED= "4 << 5 + 3" 68.elif ${BOOT_COMCONSOLE_SPEED} == 600 69BOOT_BOOT0_COMCONSOLE_SPEED= "3 << 5 + 3" 70.elif ${BOOT_COMCONSOLE_SPEED} == 300 71BOOT_BOOT0_COMCONSOLE_SPEED= "2 << 5 + 3" 72.elif ${BOOT_COMCONSOLE_SPEED} == 150 73BOOT_BOOT0_COMCONSOLE_SPEED= "1 << 5 + 3" 74.elif ${BOOT_COMCONSOLE_SPEED} == 110 75BOOT_BOOT0_COMCONSOLE_SPEED= "0 << 5 + 3" 76.else 77BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3" 78.endif 79.endif 80 81CFLAGS+=-DFLAGS=${BOOT_BOOT0_FLAGS} \ 82 -DTICKS=${BOOT_BOOT0_TICKS} \ 83 -DCOMSPEED=${BOOT_BOOT0_COMCONSOLE_SPEED} 84 85LDFLAGS+=${LDFLAGS_BIN} 86 87.include <bsd.prog.mk> 88