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-rw-r--r--chip/g/signed_header.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/chip/g/signed_header.h b/chip/g/signed_header.h
index 2da327c10d..c4e6726c40 100644
--- a/chip/g/signed_header.h
+++ b/chip/g/signed_header.h
@@ -50,5 +50,6 @@ struct SignedHeader {
BUILD_ASSERT(sizeof(struct SignedHeader) == 1024);
BUILD_ASSERT(offsetof(struct SignedHeader, info_chk_) == 1020);
-
+#define TOP_IMAGE_SIZE_BIT (1 << \
+ (sizeof(((struct SignedHeader *)0)->image_size) * 8 - 1))
#endif /* __CROS_EC_SIGNED_HEADER_H */