D3065.id6907.diff
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	Index: sbin/geom/class/part/gpart.8
	===================================================================
	--- sbin/geom/class/part/gpart.8
	+++ sbin/geom/class/part/gpart.8
	@@ -933,6 +933,11 @@
	See
	.Xr gptboot 8
	for more details.
	+.It Cm lenovofix
	+Setting this attribute writes a new GPT pMBR with the 0xee partition in the 2nd
	+slot instead of the first. This resolves a BIOS compatibility issue in some
	+Lenovo models including the X220, T420, and T520, allowing them to boot from
	+GPT partitioned disks without EFI.
	.El
	.Pp
	The scheme-specific attributes for MBR:
	Index: sys/geom/part/g_part_gpt.c
	===================================================================
	--- sys/geom/part/g_part_gpt.c
	+++ sys/geom/part/g_part_gpt.c
	@@ -1007,6 +1007,7 @@
	{
	struct g_part_gpt_entry *entry;
	struct g_part_gpt_table *table;
	+ struct g_provider *pp;
	uint8_t *p;
	uint64_t attr;
	int i;
	@@ -1036,6 +1037,22 @@
	}
	}
	return (0);
	+ } else if (strcasecmp(attrib, "lenovofix") == 0) {
	+ /*
	+ * Write the 0xee GPT entry to slot #1 (2nd slot) in the pMBR.
	+ * This workaround allows Lenovo X220, T420, T520, etc to boot
	+ * from GPT Partitions in BIOS mode.
	+ */
	+
	+ if (entry != NULL)
	+ return (ENXIO);
	+
	+ pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
	+ bzero(table->mbr + DOSPARTOFF, DOSPARTSIZE * NDOSPART);
	+ gpt_write_mbr_entry(table->mbr, 1, 0xee, 1,
	+ MIN(pp->mediasize / pp->sectorsize - 1, UINT32_MAX));
	+ le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
	+ return (0);
	}

	if (entry == NULL)