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ppc4xx: Fix incorrect MODTx setup for some DIMM configurations

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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>
This commit is contained in:
Stefan Roese 2008-07-18 15:57:23 +02:00
parent 699f051255
commit 66fe183b1d
1 changed files with 12 additions and 12 deletions
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24
cpu/ppc4xx/44x_spd_ddr2.c
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@ -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;
}
}