Table of interleaving modes supported in cpu/8xxx/ddr/
======================================================
+-------------+---------------------------------------------------------+
- | | Rank Interleaving |
- | +--------+-----------+-----------+------------+-----------+
- |Memory | | | | 2x2 | 4x1 |
- |Controller | None | 2x1 lower | 2x1 upper | {CS0+CS1}, | {CS0+CS1+ |
- |Interleaving | | {CS0+CS1} | {CS2+CS3} | {CS2+CS3} | CS2+CS3} |
+ | | Rank Interleaving |
+ | +--------+-----------+-----------+------------+-----------+
+ |Memory | | | | 2x2 | 4x1 |
+ |Controller | None | 2x1 lower | 2x1 upper | {CS0+CS1}, | {CS0+CS1+ |
+ |Interleaving | | {CS0+CS1} | {CS2+CS3} | {CS2+CS3} | CS2+CS3} |
+-------------+--------+-----------+-----------+------------+-----------+
- |None | Yes | Yes | Yes | Yes | Yes |
+ |None | Yes | Yes | Yes | Yes | Yes |
+-------------+--------+-----------+-----------+------------+-----------+
- |Cacheline | Yes | Yes | No | No, Only(*)| Yes |
- | |CS0 Only| | | {CS0+CS1} | |
+ |Cacheline | Yes | Yes | No | No, Only(*)| Yes |
+ | |CS0 Only| | | {CS0+CS1} | |
+-------------+--------+-----------+-----------+------------+-----------+
- |Page | Yes | Yes | No | No, Only(*)| Yes |
- | |CS0 Only| | | {CS0+CS1} | |
+ |Page | Yes | Yes | No | No, Only(*)| Yes |
+ | |CS0 Only| | | {CS0+CS1} | |
+-------------+--------+-----------+-----------+------------+-----------+
- |Bank | Yes | Yes | No | No, Only(*)| Yes |
- | |CS0 Only| | | {CS0+CS1} | |
+ |Bank | Yes | Yes | No | No, Only(*)| Yes |
+ | |CS0 Only| | | {CS0+CS1} | |
+-------------+--------+-----------+-----------+------------+-----------+
- |Superbank | No | Yes | No | No, Only(*)| Yes |
- | | | | | {CS0+CS1} | |
+ |Superbank | No | Yes | No | No, Only(*)| Yes |
+ | | | | | {CS0+CS1} | |
+-------------+--------+-----------+-----------+------------+-----------+
(*) Although the hardware can be configured with memory controller
interleaving using "2x2" rank interleaving, it only interleaves {CS0+CS1}
from each controller. {CS2+CS3} on each controller are only rank
interleaved on that controller.
+ For memory controller interleaving, identical DIMMs are suggested. Software
+ doesn't check the size or organization of interleaved DIMMs.
+
The ways to configure the ddr interleaving mode
==============================================
1. In board header file(e.g.MPC8572DS.h), add default interleaving setting
under "CONFIG_EXTRA_ENV_SETTINGS", like:
#define CONFIG_EXTRA_ENV_SETTINGS \
- "memctl_intlv_ctl=2\0" \
+ "hwconfig=fsl_ddr:ctlr_intlv=bank" \
......
2. Run u-boot "setenv" command to configure the memory interleaving mode.
Either numerical or string value is accepted.
# disable memory controller interleaving
- setenv memctl_intlv_ctl
+ setenv hwconfig "fsl_ddr:ctlr_intlv=null"
# cacheline interleaving
- setenv memctl_intlv_ctl 0 or setenv memctl_intlv_ctl cacheline
+ setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline"
# page interleaving
- setenv memctl_intlv_ctl 1 or setenv memctl_intlv_ctl page
+ setenv hwconfig "fsl_ddr:ctlr_intlv=page"
# bank interleaving
- setenv memctl_intlv_ctl 2 or setenv memctl_intlv_ctl bank
+ setenv hwconfig "fsl_ddr:ctlr_intlv=bank"
# superbank
- setenv memctl_intlv_ctl 3 or setenv memctl_intlv_ctl superbank
+ setenv hwconfig "fsl_ddr:ctlr_intlv=superbank"
# disable bank (chip-select) interleaving
- setenv ba_intlv_ctl
+ setenv hwconfig "fsl_ddr:bank_intlv=null"
# bank(chip-select) interleaving cs0+cs1
- setenv ba_intlv_ctl 0x40 or setenv ba_intlv_ctl cs0_cs1
+ setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1"
# bank(chip-select) interleaving cs2+cs3
- setenv ba_intlv_ctl 0x20 or setenv ba_intlv_ctl cs2_cs3
+ setenv hwconfig "fsl_ddr:bank_intlv=cs2_cs3"
# bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3) (2x2)
- setenv ba_intlv_ctl 0x60 or setenv ba_intlv_ctl cs0_cs1_and_cs2_cs3
+ setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_and_cs2_cs3"
# bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
- setenv ba_intlv_ctl 0x04 or setenv ba_intlv_ctl cs0_cs1_cs2_cs3
+ setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_cs2_cs3"
+
+Memory controller address hashing
+==================================
+If the DDR controller supports address hashing, it can be enabled by hwconfig.
+
+Syntax is:
+hwconfig=fsl_ddr:addr_hash=true
+
+Memory controller ECC on/off
+============================
+If ECC is enabled in board configuratoin file, i.e. #define CONFIG_DDR_ECC,
+ECC can be turned on/off by hwconfig.
+
+Syntax is
+hwconfig=fsl_ddr:ecc=off
+
+Memory testing options for mpc85xx
+==================================
+1. Memory test can be done once U-boot prompt comes up using mtest, or
+2. Memory test can be done with Power-On-Self-Test function, activated at
+ compile time.
+
+ In order to enable the POST memory test, CONFIG_POST needs to be
+ defined in board configuraiton header file. By default, POST memory test
+ performs a fast test. A slow test can be enabled by changing the flag at
+ compiling time. To test memory bigger than 2GB, 36BIT support is needed.
+ Memory is tested within a 2GB window. TLBs are used to map the virtual 2GB
+ window to physical address so that all physical memory can be tested.
+
+Combination of hwconfig
+=======================
+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,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
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