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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} |
+-------------+--------+-----------+-----------+------------+-----------+
|None | Yes | Yes | Yes | Yes | Yes |
+-------------+--------+-----------+-----------+------------+-----------+
|Cacheline | 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} | |
+-------------+--------+-----------+-----------+------------+-----------+
|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 \
"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 hwconfig "fsl_ddr:ctlr_intlv=null"
# cacheline interleaving
setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline"
# page interleaving
setenv hwconfig "fsl_ddr:ctlr_intlv=page"
# bank interleaving
setenv hwconfig "fsl_ddr:ctlr_intlv=bank"
# superbank
setenv hwconfig "fsl_ddr:ctlr_intlv=superbank"
# disable bank (chip-select) interleaving
setenv hwconfig "fsl_ddr:bank_intlv=null"
# bank(chip-select) interleaving cs0+cs1
setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1"
# bank(chip-select) interleaving cs2+cs3
setenv hwconfig "fsl_ddr:bank_intlv=cs2_cs3"
# bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3) (2x2)
setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_and_cs2_cs3"
# bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_cs2_cs3"
The above memory controller interleaving and bank interleaving can be mixed. The syntax is
setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline,bank_intlv=cs0_cs1"
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