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Index: stand/i386/boot0/Makefile
===================================================================
--- stand/i386/boot0/Makefile
+++ stand/i386/boot0/Makefile
@@ -42,6 +42,12 @@
ORG=${BOOT_BOOT0_ORG}
# Comm settings for boot0sio.
+#
+# boot0sio uses BIOS INT $0x14 for serial ports, so we're severely limited in in
+# what baudrates we support due to its severely limited interface. In addition, if
+# BOOT_BOOT0_COMCONSOLE_SPEED=0, then the baud rate and format will be unchanged
+# from whatever the BIOS initialized the port to (which is often 115200).
+#
# Bit(s) Description
# 7-5 data rate (110,150,300,600,1200,2400,4800,9600 bps)
# 4-3 parity (00 or 10 = none, 01 = odd, 11 = even)

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