D12847.id34568.diff
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	Index: head/sys/boot/common/disk.c
	===================================================================
	--- head/sys/boot/common/disk.c
	+++ head/sys/boot/common/disk.c
	@@ -89,6 +89,12 @@
	od = (struct open_disk *)dev->d_opendata;

	/*
	+ * The strategy function assumes the offset is in units of 512 byte
	+ * sectors. For larger sector sizes, we need to adjust the offset to
	+ * match the actual sector size.
	+ */
	+ offset *= (od->sectorsize / 512);
	+ /*
	* As the GPT backup partition is located at the end of the disk,
	* to avoid reading past disk end, flag bcache not to use RA.
	*/