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-rw-r--r--src/northbridge/intel/sandybridge/raminit.c11
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