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.
30 For memory controller interleaving, identical DIMMs are suggested. Software
31 doesn't check the size or organization of interleaved DIMMs.
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" \
41 2. Run u-boot "setenv" command to configure the memory interleaving mode.
42 Either numerical or string value is accepted.
44 # disable memory controller interleaving
45 setenv hwconfig "fsl_ddr:ctlr_intlv=null"
47 # cacheline interleaving
48 setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline"
51 setenv hwconfig "fsl_ddr:ctlr_intlv=page"
54 setenv hwconfig "fsl_ddr:ctlr_intlv=bank"
57 setenv hwconfig "fsl_ddr:ctlr_intlv=superbank"
59 # disable bank (chip-select) interleaving
60 setenv hwconfig "fsl_ddr:bank_intlv=null"
62 # bank(chip-select) interleaving cs0+cs1
63 setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1"
65 # bank(chip-select) interleaving cs2+cs3
66 setenv hwconfig "fsl_ddr:bank_intlv=cs2_cs3"
68 # bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3) (2x2)
69 setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_and_cs2_cs3"
71 # bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
72 setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_cs2_cs3"
74 Memory controller address hashing
75 ==================================
76 If the DDR controller supports address hashing, it can be enabled by hwconfig.
79 hwconfig=fsl_ddr:addr_hash=true
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.
87 hwconfig=fsl_ddr:ecc=off
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
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.
102 Combination of hwconfig
103 =======================
104 Hwconfig can be combined with multiple parameters, for example, on a supported
107 hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3