From 93866f73763e0bcf4d538c040844bb25ffe3ead2 Mon Sep 17 00:00:00 2001
From: Daniele Lacamera <root@danielinux.net>
Date: Tue, 26 Nov 2024 11:04:09 +0100
Subject: [PATCH] Use minimum 512B of header with delta updates

---
 tools/keytools/sign.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/keytools/sign.c b/tools/keytools/sign.c
index b8e0d7cf..06bee96c 100644
--- a/tools/keytools/sign.c
+++ b/tools/keytools/sign.c
@@ -2263,6 +2263,10 @@ static void set_signature_sizes(int secondary)
         else
             printf("Environment variable IMAGE_HEADER_SIZE=%u overridden.\n", suggested_sz);
     }
+    if ((CMD.header_sz == 256) && (CMD.delta)) {
+        printf("Adjusting header size to fit base image of delta update \n");
+        CMD.header_sz <<= 1;
+    }
     printf("Manifest header size: %u\n", CMD.header_sz);
 }