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diff --git a/board/freescale/t4rdb/ddr.h b/board/freescale/t4rdb/ddr.h
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+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __DDR_H__
+#define __DDR_H__
+struct board_specific_parameters {
+ u32 n_ranks;
+ u32 datarate_mhz_high;
+ u32 rank_gb;
+ u32 clk_adjust;
+ u32 wrlvl_start;
+ u32 wrlvl_ctl_2;
+ u32 wrlvl_ctl_3;
+};
+
+/*
+ * These tables contain all valid speeds we want to override with board
+ * specific parameters. datarate_mhz_high values need to be in ascending order
+ * for each n_ranks group.
+ */
+static const struct board_specific_parameters udimm0[] = {
+ /*
+ * memory controller 0
+ * num| hi| rank| clk| wrlvl | wrlvl | wrlvl
+ * ranks| mhz| GB |adjst| start | ctl2 | ctl3
+ */
+ {2, 1350, 4, 4, 8, 0x0809090b, 0x0c0c0d0a},
+ {2, 1350, 0, 5, 7, 0x0709090b, 0x0c0c0d09},
+ {2, 1666, 4, 4, 8, 0x080a0a0d, 0x0d10100b},
+ {2, 1666, 0, 5, 7, 0x080a0a0c, 0x0d0d0e0a},
+ {2, 1900, 0, 4, 8, 0x090a0b0e, 0x0f11120c},
+ {2, 2140, 0, 4, 8, 0x090a0b0e, 0x0f11120c},
+ {1, 1350, 0, 5, 8, 0x0809090b, 0x0c0c0d0a},
+ {1, 1700, 0, 5, 8, 0x080a0a0c, 0x0c0d0e0a},
+ {1, 1900, 0, 4, 8, 0x080a0a0c, 0x0e0e0f0a},
+ {1, 2140, 0, 4, 8, 0x090a0b0c, 0x0e0f100b},
+ {}
+};
+
+static const struct board_specific_parameters rdimm0[] = {
+ /*
+ * memory controller 0
+ * num| hi| rank| clk| wrlvl | wrlvl | wrlvl
+ * ranks| mhz| GB |adjst| start | ctl2 | ctl3
+ */
+ {4, 1350, 0, 5, 9, 0x08070605, 0x06070806},
+ {4, 1666, 0, 5, 11, 0x0a080706, 0x07090906},
+ {4, 2140, 0, 5, 12, 0x0b090807, 0x080a0b07},
+ {2, 1350, 0, 5, 9, 0x08070605, 0x06070806},
+ {2, 1666, 0, 5, 11, 0x0a090806, 0x08090a06},
+ {2, 2140, 0, 5, 12, 0x0b090807, 0x080a0b07},
+ {1, 1350, 0, 5, 9, 0x08070605, 0x06070806},
+ {1, 1666, 0, 5, 11, 0x0a090806, 0x08090a06},
+ {1, 2140, 0, 4, 12, 0x0b090807, 0x080a0b07},
+ {}
+};
+
+/*
+ * The three slots have slightly different timing. The center values are good
+ * for all slots. We use identical speed tables for them. In future use, if
+ * DIMMs require separated tables, make more entries as needed.
+ */
+static const struct board_specific_parameters *udimms[] = {
+ udimm0,
+};
+
+/*
+ * The three slots have slightly different timing. See comments above.
+ */
+static const struct board_specific_parameters *rdimms[] = {
+ rdimm0,
+};
+
+
+#endif