xref: /openbmc/u-boot/doc/README.fsl-ddr (revision 3e3eec39) 
1
2Table 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
30The ways to configure the ddr interleaving mode
31==============================================
321. In board header file(e.g.MPC8572DS.h), add default interleaving setting
33   under "CONFIG_EXTRA_ENV_SETTINGS", like:
34	#define CONFIG_EXTRA_ENV_SETTINGS				\
35	 "memctl_intlv_ctl=2\0"						\
36	 ......
37
382. Run u-boot "setenv" command to configure the memory interleaving mode.
39   Either numerical or string value is accepted.
40
41  # disable memory controller interleaving
42  setenv memctl_intlv_ctl
43
44  # cacheline interleaving
45  setenv memctl_intlv_ctl 0 or setenv memctl_intlv_ctl cacheline
46
47  # page interleaving
48  setenv memctl_intlv_ctl 1 or setenv memctl_intlv_ctl page
49
50  # bank interleaving
51  setenv memctl_intlv_ctl 2 or setenv memctl_intlv_ctl bank
52
53  # superbank
54  setenv memctl_intlv_ctl 3 or setenv memctl_intlv_ctl superbank
55
56  # disable bank (chip-select) interleaving
57  setenv ba_intlv_ctl
58
59  # bank(chip-select) interleaving cs0+cs1
60  setenv ba_intlv_ctl 0x40 or setenv ba_intlv_ctl cs0_cs1
61
62  # bank(chip-select) interleaving cs2+cs3
63  setenv ba_intlv_ctl 0x20 or setenv ba_intlv_ctl cs2_cs3
64
65  # bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3)  (2x2)
66  setenv ba_intlv_ctl 0x60 or setenv ba_intlv_ctl cs0_cs1_and_cs2_cs3
67
68  # bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
69  setenv ba_intlv_ctl 0x04 or setenv ba_intlv_ctl cs0_cs1_cs2_cs3
70