diff options
Diffstat (limited to 'src/northbridge/intel/i82810/raminit.c')
| -rw-r--r-- | src/northbridge/intel/i82810/raminit.c | 49 |
1 files changed, 37 insertions, 12 deletions
diff --git a/src/northbridge/intel/i82810/raminit.c b/src/northbridge/intel/i82810/raminit.c index 67addf6caf..23d45c924f 100644 --- a/src/northbridge/intel/i82810/raminit.c +++ b/src/northbridge/intel/i82810/raminit.c @@ -47,13 +47,13 @@ Macros and definitions. #endif /* DRAMT[7:5] - SDRAM Mode Select (SMS). */ -#define RAM_COMMAND_SELF_REFRESH 0x0 /* IE disable refresh */ -#define RAM_COMMAND_NORMAL 0x1 /* Normal refresh, 15.6us/11.7us for 100/133MHz */ -#define RAM_COMMAND_NORMAL_FR 0x2 /* Fast refresh, 7.8us/5.85us for 100/133MHz */ -#define RAM_COMMAND_NOP 0x4 -#define RAM_COMMAND_PRECHARGE 0x5 -#define RAM_COMMAND_MRS 0x6 -#define RAM_COMMAND_CBR 0x7 +#define RAM_COMMAND_SELF_REFRESH 0x0 /* Disable refresh */ +#define RAM_COMMAND_NORMAL 0x1 /* Refresh: 15.6/11.7us for 100/133MHz */ +#define RAM_COMMAND_NORMAL_FR 0x2 /* Refresh: 7.8/5.85us for 100/133MHz */ +#define RAM_COMMAND_NOP 0x4 /* NOP command */ +#define RAM_COMMAND_PRECHARGE 0x5 /* All bank precharge */ +#define RAM_COMMAND_MRS 0x6 /* Mode register set */ +#define RAM_COMMAND_CBR 0x7 /* CBR */ /*----------------------------------------------------------------------------- SDRAM configuration functions. @@ -98,6 +98,9 @@ static void do_ram_command(const struct mem_controller *ctrl, uint32_t command, DIMM-independant configuration functions. -----------------------------------------------------------------------------*/ +/* + * Set DRP - DRAM Row Population Register (Device 0). + */ static void spd_set_dram_size(const struct mem_controller *ctrl, uint32_t row_offset) { @@ -209,13 +212,35 @@ static void set_dram_timing(const struct mem_controller *ctrl) // pci_write_config8(ctrl->d0, DRAMT, 0x00); } +/* + * TODO: BUFF_SC needs to be set according to the DRAM tech (x8, x16, + * or x32), but the datasheet doesn't list all the detaisl. Currently, it + * needs to be pulled from the output of 'lspci -xxx Rx92'. + * + * Common results (tested on actual hardware) are: + * + * (DRP: c = 128MB dual sided, d = 128MB single sided, f = 256MB dual sided) + * + * BUFF_SC TOM DRP DIMM0 DIMM1 + * ---------------------------------------------------------------------------- + * 0x3356 128MB 0x0c 128MB dual-sided - + * 0xcc56 128MB 0xc0 - 128MB dual-sided + * 0x77da 128MB 0x0d 128MB single-sided - + * 0xddda 128MB 0xd0 - 128MB single-sided + * 0x0001 256MB 0xcc 128MB dual-sided 128MB dual-sided + * 0x55c6 256MB 0xdd 128MB single-sided 128MB single-sided + * 0x4445 256MB 0xcd 128MB single-sided 128MB dual-sided + * 0x1145 256MB 0xdc 128MB dual-sided 128MB single-sided + * 0x3356 256MB 0x0f 256MB dual-sided - + * 0xcc56 256MB 0xf0 - 256MB dual-sided + * 0x0001 384MB 0xcf 256MB dual-sided 128MB dual-sided + * 0x0001 384MB 0xfc 128MB dual-sided 256MB dual-sided + * 0x1145 384MB 0xdf 256MB dual-sided 128MB single-sided + * 0x4445 384MB 0xfd 128MB single-sided 256MB dual-sided + * 0x0001 512MB 0xff 256MB dual-sided 256MB dual-sided + */ static void set_dram_buffer_strength(const struct mem_controller *ctrl) { - /* TODO: This needs to be set according to the DRAM tech - * (x8, x16, or x32). Argh, Intel provides no docs on this! - * Currently, it needs to be pulled from the output of - * lspci -xxx Rx92 - */ pci_write_config16(ctrl->d0, BUFF_SC, 0x77da); } |