diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr
index 9e3c539..a7ba193 100644
--- a/doc/README.fsl-ddr
+++ b/doc/README.fsl-ddr
@@ -104,4 +104,69 @@
 Hwconfig can be combined with multiple parameters, for example, on a supported
 platform
 
-hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3
+hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3,ecc=on
+
+Table for dynamic ODT for DDR3
+==============================
+For single-slot system with quad-rank DIMM and dual-slot system, dynamic ODT may
+be needed, depending on the configuration. The numbers in the following tables are
+in Ohms.
+
+* denotes dynamic ODT
+
+Two slots system
++-----------------------+----------+---------------+-----------------------------+-----------------------------+
+|     Configuration     |          |DRAM controller|           Slot 1            |            Slot 2           |
++-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+
+|           |           |          |       |       |     Rank 1   |     Rank 2   |   Rank 1     |    Rank 2    |
++  Slot 1   |   Slot 2  |Write/Read| Write | Read  |-------+------+-------+------+-------+------+-------+------+
+|           |           |          |       |       | Write | Read | Write | Read | Write | Read | Write | Read |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | off   | off  | 30    | 30   |
+| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | off   | off  | 30    | 30   | 120   | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | 20    | 20   |       |      |
+| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | off   | off  | 20    | 20   | 120  *| off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | off   | off  | 20    | 20   |
+|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | 20    | 20   |       |      | 120   | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | 30    | 30   |       |      |
+|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | 30    | 30   |       |      | 120  *| off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+| Dual Rank |   Empty   |  Slot 1  |  off  | 75    | 40    | off  | off   | off  |       |      |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|   Empty   | Dual Rank |  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|Single Rank|   Empty   |  Slot 1  |  off  | 75    | 40    | off  |       |      |       |      |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|   Empty   |Single Rank|  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+
+Single slot system
++-------------+------------+---------------+-----------------------------+-----------------------------+
+|             |            |DRAM controller|     Rank 1   |    Rank 2    |    Rank 3    |    Rank 4    |
+|Configuration| Write/Read |-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |            | Write | Read  | Write | Read | Write | Read | Write | Read | Write | Read |
++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R1       | off   | 75    | 120  *| off  | off   | off  | 20    | 20   | off   | off  |
+|             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R2       | off   | 75    | off   | 20   | 120   | off  | 20    | 20   | off   | off  |
+|  Quad Rank  |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R3       | off   | 75    | 20    | 20   | off   | off  | 120  *| off  | off   | off  |
+|             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R4       | off   | 75    | 20    | 20   | off   | off  | off   | 20   | 120   | off  |
++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R1       | off   | 75    | 40    | off  | off   | off  |
+|  Dual Rank  |------------+-------+-------+-------+------+-------+------+
+|             |   R2       | off   | 75    | 40    | off  | off   | off  |
++-------------+------------+-------+-------+-------+------+-------+------+
+| Single Rank |   R1       | off   | 75    | 40    | off  |
++-------------+------------+-------+-------+-------+------+
+
+Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf
+          http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf