[PATCH] extboot should update number of HDs reported by BIOS

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This fixes Vista boot from virtio-blk issue.

Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
diff --git a/extboot/extboot.S b/extboot/extboot.S
index e3d1adf..1e60f68 100644
--- a/extboot/extboot.S
+++ b/extboot/extboot.S
@@ -32,6 +32,9 @@ _start:
 	xor %ax, %ax
 	mov %ax, %ds
 
+	/* there is one more bootable HD */
+	incb 0x0475
+
 	/* save old int 19 */
 	mov (0x19*4), %eax
 	mov %eax, %cs:old_int19
--
			Gleb.
--
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