boot0: add a note about BIOS-supported serial rates
We plan to increase the default serial rate to 115200 (see review D36295) but early boot components that use BIOS interfaces do not support higher rates. Add a note to that effect. Reported by: imp Sponsored by: The FreeBSD Foundation
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@ -56,7 +56,7 @@ ORG= 0x600
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# 2 stop bits (set = 2, clear = 1)
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# 1-0 data bits (00 = 5, 01 = 6, 10 = 7, 11 = 8)
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.if !defined(BOOT_BOOT0_COMCONSOLE_SPEED)
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BOOT_COMCONSOLE_SPEED?= 9600
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BOOT_COMCONSOLE_SPEED?= 9600 # BIOS interfaces do not support higher rates.
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.if ${BOOT_COMCONSOLE_SPEED} == 9600
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BOOT_BOOT0_COMCONSOLE_SPEED= "7 << 5 + 3"
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.elif ${BOOT_COMCONSOLE_SPEED} == 4800
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