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-rw-r--r--src/device/dram/ddr2.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/device/dram/ddr2.c b/src/device/dram/ddr2.c
index 921679c584..0d395c4315 100644
--- a/src/device/dram/ddr2.c
+++ b/src/device/dram/ddr2.c
@@ -72,6 +72,30 @@ u8 spd_ddr2_calc_checksum(u8 *spd, int len)
}
/**
+ * \brief Calculate the CRC of a DDR2 SPD unique identifier
+ *
+ * @param spd pointer to raw SPD data
+ * @param len length of data in SPD
+ *
+ * @return the CRC of SPD data bytes 64..72 and 93..98, or 0
+ * when spd data is truncated.
+ */
+u16 spd_ddr2_calc_unique_crc(const u8 *spd, int len)
+{
+ u8 id_bytes[15];
+ int i, j = 0;
+ if (len < 98)
+ /* Not enough bytes available to get the CRC */
+ return 0;
+ for (i = 64; i <= 72; i++)
+ id_bytes[j++] = spd[i];
+ for (i = 93; i <= 98; i++)
+ id_bytes[j++] = spd[i];
+
+ return ddr3_crc16(id_bytes, 15);
+}
+
+/**
* \brief Return size of SPD.
*
* Returns size of SPD. Usually 128 Byte.