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Index: share/mk/src.opts.mk
===================================================================
--- share/mk/src.opts.mk
+++ share/mk/src.opts.mk
@@ -202,6 +202,7 @@
__DEFAULT_NO_OPTIONS = \
BEARSSL \
BHYVE_SNAPSHOT \
+ BOOT0_RESET_TERM \
CLANG_EXTRAS \
CLANG_FORMAT \
DTRACE_TESTS \
Index: stand/i386/boot0/Makefile
===================================================================
--- stand/i386/boot0/Makefile
+++ stand/i386/boot0/Makefile
@@ -14,6 +14,7 @@
# -DCHECK_DRIVE enable checking drive number
# -DONLY_F_KEYS accept only Fx keys in console
# -DTEST print drive number on entry
+# -DRESET_TERM send terminal reset command before first output
#
OPTS ?= -DVOLUME_SERIAL -DPXE
CFLAGS += ${OPTS}
Index: stand/i386/boot0/boot0.S
===================================================================
--- stand/i386/boot0/boot0.S
+++ stand/i386/boot0/boot0.S
@@ -216,6 +216,14 @@
callw bioscom
#endif
+#if defined(SIO) && defined(RESET_TERM)
+ /*
+ * ANSI / VT100 command to reset all terminal attributes
+ */
+ movw $resetterm,%si # Reset
+ callw putstr # terminal
+#endif
+
/*
* If the 'setdrv' flag is set in the boot sector, use the drive
* number from the boot sector at 'setdrv_num'.
@@ -584,6 +592,14 @@
popw %si # Restore
retw # To caller
+#if defined(SIO) && defined(RESET_TERM)
+ /*
+ * Reset terminal ANSI/VT100 sequence
+ */
+resetterm:
+ .byte 0x1b; .byte 'c'|0x80
+#endif
+
/*
* Various menu strings. 'item' goes after 'prompt' to save space.
* Also use shorter versions to make room for the PXE/INT18 code.
Index: stand/i386/boot0sio/Makefile
===================================================================
--- stand/i386/boot0sio/Makefile
+++ stand/i386/boot0sio/Makefile
@@ -2,7 +2,13 @@
.PATH: ${.CURDIR}/../boot0
+.include <src.opts.mk>
+
PROGNAME= boot0sio
CFLAGS+= -DSIO
+.if ${MK_BOOT0_RESET_TERM} != "no"
+OPTS ?= -DRESET_TERM -DSAVE_MEMORY -DPXE
+.endif
+
.include "${.CURDIR}/../boot0/Makefile"
Index: tools/build/options/WITH_BOOT0_RESET_TERM
===================================================================
--- /dev/null
+++ tools/build/options/WITH_BOOT0_RESET_TERM
@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Set to build boot0sio to send default VT-100 reset command <ESC>c before first
+output.
+This option is not compatible with PXE and VOLUME_SERIAL options, due to space
+constraints.

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