diff options
Diffstat (limited to 'src/northbridge/intel')
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c index 7087035d9b..166416e287 100644 --- a/src/northbridge/intel/sandybridge/raminit.c +++ b/src/northbridge/intel/sandybridge/raminit.c @@ -199,6 +199,8 @@ typedef struct ramctr_timing_st { #define MAX_TIMC 127 #define MAX_TIMB 511 #define MAX_TIMA 127 +#define MAX_CAS 18 +#define MIN_CAS 4 #define MAKE_ERR ((channel<<16)|(slotrank<<8)|1) #define GET_ERR_CHANNEL(x) (x>>16) @@ -468,7 +470,7 @@ static void dram_find_common_params(ramctr_timing *ctrl) int channel, slot; dimm_info *dimms = &ctrl->info; - ctrl->cas_supported = 0xff; + ctrl->cas_supported = (1 << (MAX_CAS - MIN_CAS + 1)) - 1; valid_dimms = 0; FOR_ALL_CHANNELS for (slot = 0; slot < 2; slot++) { const dimm_attr *dimm = &dimms->dimm[channel][slot]; @@ -742,16 +744,16 @@ static void dram_timing(ramctr_timing * ctrl) val = (ctrl->tAA + ctrl->tCK - 1) / ctrl->tCK; printk(BIOS_DEBUG, "Minimum CAS latency : %uT\n", val); /* Find lowest supported CAS latency that satisfies the minimum value */ - while (!((ctrl->cas_supported >> (val - 4)) & 1) - && (ctrl->cas_supported >> (val - 4))) { + while (!((ctrl->cas_supported >> (val - MIN_CAS)) & 1) + && (ctrl->cas_supported >> (val - MIN_CAS))) { val++; } /* Is CAS supported */ - if (!(ctrl->cas_supported & (1 << (val - 4)))) { + if (!(ctrl->cas_supported & (1 << (val - MIN_CAS)))) { printk(BIOS_ERR, "CAS %uT not supported. ", val); - val = 18; + val = MAX_CAS; /* Find highest supported CAS latency */ - while (!((ctrl->cas_supported >> (val - 4)) & 1)) + while (!((ctrl->cas_supported >> (val - MIN_CAS)) & 1)) val--; printk(BIOS_ERR, "Using CAS %uT instead.\n", val); @@ -1467,7 +1469,7 @@ static u32 make_mr0(ramctr_timing * ctrl, u8 rank) // Convert tWR to MCH register friendly mch_wr = mch_wr_t[ctrl->tWR - 5]; - mr0reg = (mr0reg & ~0x4) | (mch_cas & 0x1); + mr0reg = (mr0reg & ~0x4) | ((mch_cas & 0x1) << 2); mr0reg = (mr0reg & ~0x70) | ((mch_cas & 0xe) << 3); mr0reg = (mr0reg & ~0xe00) | (mch_wr << 9); |