git.sur5r.net Git - u-boot/blob - doc/README.fsl-ddr

   1
   2 Table of interleaving modes supported in cpu/8xxx/ddr/
   3 ======================================================
   4   +-------------+---------------------------------------------------------+
   5   |             |                   Rank Interleaving                     |
   6   |             +--------+-----------+-----------+------------+-----------+
   7   |Memory       |        |           |           |    2x2     |    4x1    |
   8   |Controller   |  None  | 2x1 lower | 2x1 upper | {CS0+CS1}, | {CS0+CS1+ |
   9   |Interleaving |        | {CS0+CS1} | {CS2+CS3} | {CS2+CS3}  |  CS2+CS3} |
  10   +-------------+--------+-----------+-----------+------------+-----------+
  11   |None         |  Yes   | Yes       | Yes       | Yes        | Yes       |
  12   +-------------+--------+-----------+-----------+------------+-----------+
  13   |Cacheline    |  Yes   | Yes       | No        | No, Only(*)| Yes       |
  14   |             |CS0 Only|           |           | {CS0+CS1}  |           |
  15   +-------------+--------+-----------+-----------+------------+-----------+
  16   |Page         |  Yes   | Yes       | No        | No, Only(*)| Yes       |
  17   |             |CS0 Only|           |           | {CS0+CS1}  |           |
  18   +-------------+--------+-----------+-----------+------------+-----------+
  19   |Bank         |  Yes   | Yes       | No        | No, Only(*)| Yes       |
  20   |             |CS0 Only|           |           | {CS0+CS1}  |           |
  21   +-------------+--------+-----------+-----------+------------+-----------+
  22   |Superbank    |  No    | Yes       | No        | No, Only(*)| Yes       |
  23   |             |        |           |           | {CS0+CS1}  |           |
  24   +-------------+--------+-----------+-----------+------------+-----------+
  25  (*) Although the hardware can be configured with memory controller
  26  interleaving using "2x2" rank interleaving, it only interleaves {CS0+CS1}
  27  from each controller. {CS2+CS3} on each controller are only rank
  28  interleaved on that controller.
  29
  30  For memory controller interleaving, identical DIMMs are suggested. Software
  31  doesn't check the size or organization of interleaved DIMMs.
  32
  33 The ways to configure the ddr interleaving mode
  34 ==============================================
  35 1. In board header file(e.g.MPC8572DS.h), add default interleaving setting
  36    under "CONFIG_EXTRA_ENV_SETTINGS", like:
  37         #define CONFIG_EXTRA_ENV_SETTINGS                               \
  38          "hwconfig=fsl_ddr:ctlr_intlv=bank"                     \
  39          ......
  40
  41 2. Run u-boot "setenv" command to configure the memory interleaving mode.
  42    Either numerical or string value is accepted.
  43
  44   # disable memory controller interleaving
  45   setenv hwconfig "fsl_ddr:ctlr_intlv=null"
  46
  47   # cacheline interleaving
  48   setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline"
  49
  50   # page interleaving
  51   setenv hwconfig "fsl_ddr:ctlr_intlv=page"
  52
  53   # bank interleaving
  54   setenv hwconfig "fsl_ddr:ctlr_intlv=bank"
  55
  56   # superbank
  57   setenv hwconfig "fsl_ddr:ctlr_intlv=superbank"
  58
  59   # disable bank (chip-select) interleaving
  60   setenv hwconfig "fsl_ddr:bank_intlv=null"
  61
  62   # bank(chip-select) interleaving cs0+cs1
  63   setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1"
  64
  65   # bank(chip-select) interleaving cs2+cs3
  66   setenv hwconfig "fsl_ddr:bank_intlv=cs2_cs3"
  67
  68   # bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3)  (2x2)
  69   setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_and_cs2_cs3"
  70
  71   # bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
  72   setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_cs2_cs3"
  73
  74 Memory controller address hashing
  75 ==================================
  76 If the DDR controller supports address hashing, it can be enabled by hwconfig.
  77
  78 Syntax is:
  79 hwconfig=fsl_ddr:addr_hash=true
  80
  81 Memory controller ECC on/off
  82 ============================
  83 If ECC is enabled in board configuratoin file, i.e. #define CONFIG_DDR_ECC,
  84 ECC can be turned on/off by hwconfig.
  85
  86 Syntax is
  87 hwconfig=fsl_ddr:ecc=off
  88
  89 Memory testing options for mpc85xx
  90 ==================================
  91 1. Memory test can be done once U-boot prompt comes up using mtest, or
  92 2. Memory test can be done with Power-On-Self-Test function, activated at
  93    compile time.
  94
  95    In order to enable the POST memory test, CONFIG_POST needs to be
  96    defined in board configuraiton header file. By default, POST memory test
  97    performs a fast test. A slow test can be enabled by changing the flag at
  98    compiling time. To test memory bigger than 2GB, 36BIT support is needed.
  99    Memory is tested within a 2GB window. TLBs are used to map the virtual 2GB
 100    window to physical address so that all physical memory can be tested.
 101
 102 Combination of hwconfig
 103 =======================
 104 Hwconfig can be combined with multiple parameters, for example, on a supported
 105 platform
 106
 107 hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3,ecc=on
 108
 109 Table for dynamic ODT for DDR3
 110 ==============================
 111 For single-slot system with quad-rank DIMM and dual-slot system, dynamic ODT may
 112 be needed, depending on the configuration. The numbers in the following tables are
 113 in Ohms.
 114
 115 * denotes dynamic ODT
 116
 117 Two slots system
 118 +-----------------------+----------+---------------+-----------------------------+-----------------------------+
 119 |     Configuration     |          |DRAM controller|           Slot 1            |            Slot 2           |
 120 +-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+
 121 |           |           |          |       |       |     Rank 1   |     Rank 2   |   Rank 1     |    Rank 2    |
 122 +  Slot 1   |   Slot 2  |Write/Read| Write | Read  |-------+------+-------+------+-------+------+-------+------+
 123 |           |           |          |       |       | Write | Read | Write | Read | Write | Read | Write | Read |
 124 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 125 |           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | off   | off  | 30    | 30   |
 126 | Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 127 |           |           |  Slot 2  |  off  | 75    | off   | off  | 30    | 30   | 120   | off  | off   | off  |
 128 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 129 |           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | 20    | 20   |       |      |
 130 | Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 131 |           |           |  Slot 2  |  off  | 75    | off   | off  | 20    | 20   | 120  *| off  |       |      |
 132 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 133 |           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | off   | off  | 20    | 20   |
 134 |Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 135 |           |           |  Slot 2  |  off  | 75    | 20    | 20   |       |      | 120   | off  | off   | off  |
 136 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 137 |           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | 30    | 30   |       |      |
 138 |Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 139 |           |           |  Slot 2  |  off  | 75    | 30    | 30   |       |      | 120  *| off  |       |      |
 140 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 141 | Dual Rank |   Empty   |  Slot 1  |  off  | 75    | 40    | off  | off   | off  |       |      |       |      |
 142 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 143 |   Empty   | Dual Rank |  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  | off   | off  |
 144 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 145 |Single Rank|   Empty   |  Slot 1  |  off  | 75    | 40    | off  |       |      |       |      |       |      |
 146 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 147 |   Empty   |Single Rank|  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  |       |      |
 148 +-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 149
 150 Single slot system
 151 +-------------+------------+---------------+-----------------------------+-----------------------------+
 152 |             |            |DRAM controller|     Rank 1   |    Rank 2    |    Rank 3    |    Rank 4    |
 153 |Configuration| Write/Read |-------+-------+-------+------+-------+------+-------+------+-------+------+
 154 |             |            | Write | Read  | Write | Read | Write | Read | Write | Read | Write | Read |
 155 +-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 156 |             |   R1       | off   | 75    | 120  *| off  | off   | off  | 20    | 20   | off   | off  |
 157 |             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 158 |             |   R2       | off   | 75    | off   | 20   | 120   | off  | 20    | 20   | off   | off  |
 159 |  Quad Rank  |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 160 |             |   R3       | off   | 75    | 20    | 20   | off   | off  | 120  *| off  | off   | off  |
 161 |             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 162 |             |   R4       | off   | 75    | 20    | 20   | off   | off  | off   | 20   | 120   | off  |
 163 +-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
 164 |             |   R1       | off   | 75    | 40    | off  | off   | off  |
 165 |  Dual Rank  |------------+-------+-------+-------+------+-------+------+
 166 |             |   R2       | off   | 75    | 40    | off  | off   | off  |
 167 +-------------+------------+-------+-------+-------+------+-------+------+
 168 | Single Rank |   R1       | off   | 75    | 40    | off  |
 169 +-------------+------------+-------+-------+-------+------+
 170
 171 Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf
 172           http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf