Change in coreboot[master]: cbfstool/fit.c: Fix for older CPUs without total_size in mcu_header

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change and it was merged. ( https://review.coreboot.org/27090 )

Change subject: cbfstool/fit.c: Fix for older CPUs without total_size in mcu_header
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cbfstool/fit.c: Fix for older CPUs without total_size in mcu_header

Some older CPUs have a fixed size of 2048 bytes for microcode total size.

Change-Id: Ia50c087af41b0df14b607ce3c3b4eabc602e8738
Signed-off-by: Arthur Heymans 
Reviewed-on: https://review.coreboot.org/27090
Reviewed-by: Patrick Georgi 
Tested-by: build bot (Jenkins) 
---
M util/cbfstool/fit.c
1 file changed, 7 insertions(+), 2 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Patrick Georgi: Looks good to me, approved

diff --git a/util/cbfstool/fit.c b/util/cbfstool/fit.c
index e3e6c32..d33cb56 100644
--- a/util/cbfstool/fit.c
+++ b/util/cbfstool/fit.c
@@ -226,13 +226,18 @@

mcu_header = rom_buffer_pointer(&image->buffer, current_offset);

+		/* Newer microcode updates include a size field, whereas older
+		 * containers set it at 0 and are exactly 2048 bytes long */
+		uint32_t total_size = mcu_header->total_size
+			? mcu_header->total_size : 2048;
+
    	/* Quickly sanity check a prospective microcode update. */
-		if (mcu_header->total_size < sizeof(*mcu_header))
+		if (total_size < sizeof(*mcu_header))
    		break;

/* FIXME: Should the checksum be validated? */
    	mcus[num_mcus].offset = current_offset;
-		mcus[num_mcus].size = mcu_header->total_size;
+		mcus[num_mcus].size = total_size;

/* Proceed to next payload. */
    	current_offset += mcus[num_mcus].size;