D36152.id109290.diff
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	diff --git a/stand/i386/loader/Makefile b/stand/i386/loader/Makefile
	--- a/stand/i386/loader/Makefile
	+++ b/stand/i386/loader/Makefile
	@@ -19,8 +19,22 @@
	INTERNALPROG=
	NEWVERSWHAT?= "bootstrap loader" x86
	VERSION_FILE= ${.CURDIR}/../loader/version
	-LOADERSIZE?= 508000 # Largest known safe size for loader.bin
	-
	+#
	+# There's 640k - 40k maximum space, less however much memory the BIOS uses. A
	+# non-random survey suggests that 20k-25k is a good value for 'most' machines.
	+# We also need to subtract maximum stack usage (20-25k).
	+#
	+# So 640k - 40k - 25k - 25k = 550k = 563,200 bytes, but use 550,000 below for
	+# some extra buffer for more complex setups and/or wider BIOS lomem variation.
	+#
	+# Some systems use more stack or have BIOS resere more RAM (or both), and will
	+# need to set this lower in /etc/loader.conf if the above buffer is too small.
	+#
	+# sudo dd if=/dev/mem bs=1 iseek=0x413 count=2 \| hd -d
	+#
	+# will tell you how many kiB of lomem are available.
	+#
	+LOADERSIZE?= 550000 # Largest known safe size for loader.bin

	.PATH: ${BOOTSRC}/i386/loader