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authorStefan Roese <sr@denx.de>2008-07-18 15:57:23 +0200
committerStefan Roese <sr@denx.de>2008-07-18 15:57:23 +0200
commit66fe183b1dd9c7534605147a8ecfed1c02345ee5 (patch)
treeaa34ce1eea6c8c851543c497cf56a20bc0b195ef /cpu
parent699f05125509249072a0b865c8d35520d97cd501 (diff)
ppc4xx: Fix incorrect MODTx setup for some DIMM configurations
This patch fixes a problem with incorrect MODTx (On Die Termination) setup for a configuration with multiple DIMM's and multiple ranks. Without this change Katmai was unable to boot Linux with DDR2 frequency >= 533MHz and mem>=3GB. With this patch Katmai successfully boots Linux with DDR2 frequency = 640MHz and mem=4GB. Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'cpu')
-rw-r--r--cpu/ppc4xx/44x_spd_ddr2.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c
index a27e276f2..e9940e8e5 100644
--- a/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/cpu/ppc4xx/44x_spd_ddr2.c
@@ -1150,50 +1150,50 @@ static void program_codt(unsigned long *dimm_populated,
if (dimm_type == SDRAM_DDR2) {
codt |= SDRAM_CODT_DQS_1_8_V_DDR2;
if ((total_dimm == 1) && (firstSlot == TRUE)) {
- if (total_rank == 1) {
+ if (total_rank == 1) { /* PUUU */
codt |= CALC_ODT_R(0);
modt0 = CALC_ODT_W(0);
modt1 = 0x00000000;
modt2 = 0x00000000;
modt3 = 0x00000000;
}
- if (total_rank == 2) {
+ if (total_rank == 2) { /* PPUU */
codt |= CALC_ODT_R(0) | CALC_ODT_R(1);
- modt0 = CALC_ODT_W(0);
- modt1 = CALC_ODT_W(0);
+ modt0 = CALC_ODT_W(0) | CALC_ODT_W(1);
+ modt1 = 0x00000000;
modt2 = 0x00000000;
modt3 = 0x00000000;
}
} else if ((total_dimm == 1) && (firstSlot != TRUE)) {
- if (total_rank == 1) {
+ if (total_rank == 1) { /* UUPU */
codt |= CALC_ODT_R(2);
modt0 = 0x00000000;
modt1 = 0x00000000;
modt2 = CALC_ODT_W(2);
modt3 = 0x00000000;
}
- if (total_rank == 2) {
+ if (total_rank == 2) { /* UUPP */
codt |= CALC_ODT_R(2) | CALC_ODT_R(3);
modt0 = 0x00000000;
modt1 = 0x00000000;
- modt2 = CALC_ODT_W(2);
- modt3 = CALC_ODT_W(2);
+ modt2 = CALC_ODT_W(2) | CALC_ODT_W(3);
+ modt3 = 0x00000000;
}
}
if (total_dimm == 2) {
- if (total_rank == 2) {
+ if (total_rank == 2) { /* PUPU */
codt |= CALC_ODT_R(0) | CALC_ODT_R(2);
modt0 = CALC_ODT_RW(2);
modt1 = 0x00000000;
modt2 = CALC_ODT_RW(0);
modt3 = 0x00000000;
}
- if (total_rank == 4) {
+ if (total_rank == 4) { /* PPPP */
codt |= CALC_ODT_R(0) | CALC_ODT_R(1) |
CALC_ODT_R(2) | CALC_ODT_R(3);
- modt0 = CALC_ODT_RW(2);
+ modt0 = CALC_ODT_RW(2) | CALC_ODT_RW(3);
modt1 = 0x00000000;
- modt2 = CALC_ODT_RW(0);
+ modt2 = CALC_ODT_RW(0) | CALC_ODT_RW(1);
modt3 = 0x00000000;
}
}