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| -rw-r--r-- | doc/README.fsl-ddr | 69 |
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diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr new file mode 100644 index 0000000..9c2224f --- /dev/null +++ b/doc/README.fsl-ddr @@ -0,0 +1,69 @@ + +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. + +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" \ + ...... + +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 + + # cacheline interleaving + setenv memctl_intlv_ctl 0 or setenv memctl_intlv_ctl cacheline + + # page interleaving + setenv memctl_intlv_ctl 1 or setenv memctl_intlv_ctl page + + # bank interleaving + setenv memctl_intlv_ctl 2 or setenv memctl_intlv_ctl bank + + # superbank + setenv memctl_intlv_ctl 3 or setenv memctl_intlv_ctl superbank + + # disable bank (chip-select) interleaving + setenv ba_intlv_ctl + + # bank(chip-select) interleaving cs0+cs1 + setenv ba_intlv_ctl 0x40 or setenv ba_intlv_ctl cs0_cs1 + + # bank(chip-select) interleaving cs2+cs3 + setenv ba_intlv_ctl 0x20 or setenv ba_intlv_ctl 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 + + # bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1) + setenv ba_intlv_ctl 0x04 or setenv ba_intlv_ctl cs0_cs1_cs2_cs3 |