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 --- cpu/ppc4xx/44x_spd_ddr2.c | 24 ++++++++++++------------ 1 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c index a27e276..e9940e8 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; } }