diff options
| -rw-r--r-- | src/northbridge/intel/sandybridge/raminit.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c index 0c191b2abd..1ed77ebd44 100644 --- a/src/northbridge/intel/sandybridge/raminit.c +++ b/src/northbridge/intel/sandybridge/raminit.c @@ -810,6 +810,17 @@ static void dram_freq(ramctr_timing * ctrl) /* Frequency mulitplier. */ u32 FRQ = get_FRQ(ctrl->tCK); + /* The PLL will never lock if the required frequency is + * already set. Exit early to prevent a system hang. + */ + reg1 = MCHBAR32(0x5e04); + val2 = (u8) reg1; + if (val2 == FRQ) { + printk(BIOS_DEBUG, "MCU frequency is set at : %d MHz\n", + (1000 << 8) / ctrl->tCK); + return; + } + /* Step 2 - Select frequency in the MCU */ reg1 = FRQ; reg1 |= 0x80000000; // set running bit |