1 files changed, 39 insertions, 0 deletions
diff --git a/common/ddr_spd.c b/common/ddr_spd.c
new file mode 100644
index 0000000000..c8b73ff56c
--- /dev/null
+++ b/common/ddr_spd.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 as published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <ddr_spd.h>
+
+uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd)
+{
+	uint32_t i, cksum = 0;
+	const uint8_t *buf = (const uint8_t *)spd;
+	uint8_t rev, spd_cksum;
+
+	rev = spd->spd_rev;
+	spd_cksum = spd->cksum;
+
+	/* Rev 1.X or less supported by this code */
+	if (rev >= 0x20)
+		goto error;
+
+	/*
+	 * The checksum is calculated on the first 64 bytes
+	 * of the SPD as per JEDEC specification.
+	 */
+	for (i = 0; i < 63; i++)
+		cksum += *buf++;
+	cksum &= 0xFF;
+
+	if (cksum != spd_cksum)
+		goto error;
+
+	return 0;
+error:
+	return 1;
+}