X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=common%2Fddr_spd.c;h=58dc9b3781b7ca93eb2e5d51908a440dfc01c817;hb=9b2c8c30668c2d3ea8637cdce436be67241981b3;hp=a7a30de22bb567777f600f00e0b9d670523a316e;hpb=3707f3b0b5a3af4be41c9dcf791b3338732d8c7c;p=oweals%2Fu-boot.git

diff --git a/common/ddr_spd.c b/common/ddr_spd.c
index a7a30de22b..58dc9b3781 100644
--- a/common/ddr_spd.c
+++ b/common/ddr_spd.c
@@ -1,9 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
- * 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.
+ * Copyright 2008-2014 Freescale Semiconductor, Inc.
  */
 
 #include <common.h>
@@ -18,7 +15,7 @@ spd_check(const u8 *buf, u8 spd_rev, u8 spd_cksum)
 
 	/*
 	 * Check SPD revision supported
-	 * Rev 1.2 or less supported by this code
+	 * Rev 1.X or less supported by this code
 	 */
 	if (spd_rev >= 0x20) {
 		printf("SPD revision %02X not supported by this code\n",
@@ -116,3 +113,46 @@ ddr3_spd_check(const ddr3_spd_eeprom_t *spd)
 		return 1;
 	}
 }
+
+unsigned int ddr4_spd_check(const struct ddr4_spd_eeprom_s *spd)
+{
+	char *p = (char *)spd;
+	int csum16;
+	int len;
+	char crc_lsb;	/* byte 126 */
+	char crc_msb;	/* byte 127 */
+
+	len = 126;
+	csum16 = crc16(p, len);
+
+	crc_lsb = (char) (csum16 & 0xff);
+	crc_msb = (char) (csum16 >> 8);
+
+	if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb) {
+		printf("SPD checksum unexpected.\n"
+			"Checksum lsb in SPD = %02X, computed SPD = %02X\n"
+			"Checksum msb in SPD = %02X, computed SPD = %02X\n",
+			spd->crc[0], crc_lsb, spd->crc[1], crc_msb);
+		return 1;
+	}
+
+	p = (char *)((ulong)spd + 128);
+	len = 126;
+	csum16 = crc16(p, len);
+
+	crc_lsb = (char) (csum16 & 0xff);
+	crc_msb = (char) (csum16 >> 8);
+
+	if (spd->mod_section.uc[126] != crc_lsb ||
+	    spd->mod_section.uc[127] != crc_msb) {
+		printf("SPD checksum unexpected.\n"
+			"Checksum lsb in SPD = %02X, computed SPD = %02X\n"
+			"Checksum msb in SPD = %02X, computed SPD = %02X\n",
+			spd->mod_section.uc[126],
+			crc_lsb, spd->mod_section.uc[127],
+			crc_msb);
+		return 1;
+	}
+
+	return 0;
+}