D42245.id128886.diff
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D42245.id128886.diff
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	diff --git a/sys/sys/disk/gpt.h b/sys/sys/disk/gpt.h
	--- a/sys/sys/disk/gpt.h
	+++ b/sys/sys/disk/gpt.h
	@@ -82,6 +82,13 @@
	CTASSERT(offsetof(struct gpt_hdr, padding) == 92);
	#endif

	+/*
	+ * The GPT standard (section 5.3 of UEFI standard version 2.10) requires
	+ * we reserved at least 16k after the PMBR and the GPT header for the gpt
	+ * array entries.
	+ */
	+#define GPT_MIN_RESERVED 16384
	+
	struct gpt_ent {
	gpt_uuid_t ent_type;
	gpt_uuid_t ent_uuid;
	diff --git a/usr.bin/mkimg/gpt.c b/usr.bin/mkimg/gpt.c
	--- a/usr.bin/mkimg/gpt.c
	+++ b/usr.bin/mkimg/gpt.c
	@@ -129,8 +129,14 @@
	{
	u_int ents;

	+ /*
	+ * Round the number of sectors used by the existing partitions up to the
	+ * sector size. The GPT standard (see section 5.3 of UEFI standard
	+ * version 2.1) requires the reserved space be at last 16k (stated in an
	+ * odd way), so enforce that minimum here as well.
	+ */
	ents = secsz / sizeof(struct gpt_ent);
	- return ((nparts + ents - 1) / ents);
	+ return (min(GPT_MIN_RESERVED / secsz, (nparts + ents - 1) / ents));
	}

	static lba_t