soc/intel/cannonlake: Disable RTC write protect

The cannonlake FSP enables PchLockDownRtcMemoryLock by default, but we
need this memory to be writable.  We normally over-ride this in the
SoC chip init code, so we'll do the same on cannonlake.

TEST=Filled /dev/nvram with 0xff and 0x00 bytes to verify we can flip
all the bits.

Change-Id: I7cdd4abc2b3795d7dd82236fbe3c112428ee882b
Signed-off-by: Caveh Jalali <>
Tested-by: build bot (Jenkins) <>
Reviewed-by: Vincent Palatin <>
1 file changed