7 # Additional options that you can specify with make OPTS="..."
8 # (these only apply to boot0.S)
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
17 OPTS ?= -DVOLUME_SERIAL -DPXE
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.
31 BOOT_BOOT0_FLAGS?= 0x8f
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.
36 BOOT_BOOT0_TICKS?= 0xb6
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
44 # Comm settings for boot0sio.
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.
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)
58 BOOT_COMCONSOLE_SPEED?= 9600 # BIOS interfaces do not support higher rates.
59 .if ${BOOT_COMCONSOLE_SPEED} == 9600
60 BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3"
61 .elif ${BOOT_COMCONSOLE_SPEED} == 4800
62 BOOT_BOOT0_COMCONSOLE_SPEED= "6 << 5 + 3"
63 .elif ${BOOT_COMCONSOLE_SPEED} == 2400
64 BOOT_BOOT0_COMCONSOLE_SPEED= "5 << 5 + 3"
65 .elif ${BOOT_COMCONSOLE_SPEED} == 1200
66 BOOT_BOOT0_COMCONSOLE_SPEED= "4 << 5 + 3"
67 .elif ${BOOT_COMCONSOLE_SPEED} == 600
68 BOOT_BOOT0_COMCONSOLE_SPEED= "3 << 5 + 3"
69 .elif ${BOOT_COMCONSOLE_SPEED} == 300
70 BOOT_BOOT0_COMCONSOLE_SPEED= "2 << 5 + 3"
71 .elif ${BOOT_COMCONSOLE_SPEED} == 150
72 BOOT_BOOT0_COMCONSOLE_SPEED= "1 << 5 + 3"
73 .elif ${BOOT_COMCONSOLE_SPEED} == 110
74 BOOT_BOOT0_COMCONSOLE_SPEED= "0 << 5 + 3"
76 BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3"
80 CFLAGS+=-DFLAGS=${BOOT_BOOT0_FLAGS} \
81 -DTICKS=${BOOT_BOOT0_TICKS} \
82 -DCOMSPEED=${BOOT_BOOT0_COMCONSOLE_SPEED}
84 LDFLAGS+=${LDFLAGS_BIN}
86 .include <bsd.prog.mk>