From adc76e38140e29526131d35f2c102009bfafeff8 Mon Sep 17 00:00:00 2001
From: Leah Rowe <leah@libreboot.org>
Date: Sat, 28 Jan 2023 21:19:29 +0000
Subject: util/nvmutil: do not write non-changes to disk

---
 util/nvmutil/nvmutil.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'util')

diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index abbf2439..6dbe5186 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -129,6 +129,8 @@ main(int argc, char *argv[])
 
 	if (gbeFileModified)
 		writeGbeFile(&fd, FILENAME);
+	else if ((cmd != &cmd_dump))
+		printf("File `%s` not modified.\n", FILENAME);
 
 nvmutil_exit:
 	if ((errno != 0) && (cmd != &cmd_dump))
@@ -406,6 +408,9 @@ word(int pos16, int partnum)
 void
 setWord(int pos16, int partnum, uint16_t val16)
 {
+	if (word(pos16, partnum) == val16)
+		return;
+
 	uint8_t *nbuf = (uint8_t *) gbe[partnum];
 	uint8_t val8[2] = {(uint8_t) (val16 & 0xff), (uint8_t) (val16 >> 8)};
 	uint16_t pos8 = pos16 << 1;
-- 
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