From b349abbfe95972ee7770d8ffef0eaf45cc84f419 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Thu, 8 Jan 2015 12:26:44 +0100
Subject: [PATCH] gpt: Fix the protective MBR partition size
According to the UEFI Spec (Table 16, section 5.2.3 of the version 2.4 Errata
B), the protective MBR partition record size must be set to the size of the
disk minus one, in LBAs.
However, the current code was setting the size as the total number of LBAs on
the disk, resulting in an off-by-one error.
This confused the AM335x ROM code, and will probably confuse other tools as
well.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
disk/part_efi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/disk/part_efi.c b/disk/part_efi.c
index 338010e148..5856f93211 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -342,7 +342,7 @@ static int set_protective_mbr(block_dev_desc_t *dev_desc)
p_mbr->signature = MSDOS_MBR_SIGNATURE;
p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
p_mbr->partition_record[0].start_sect = 1;
- p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba;
+ p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
/* Write MBR sector to the MMC device */
if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) {
--
2.39.5