Add the following fallbacks: * Try decreasing clock frequency. In case of DDR1600 the next possible value of DDR1333 is being used. * Try decreasing clock frequency. In case of DDR1333 the next possible value of DDR1066 is being used. * Disable failing channel. The system may be able to boot with a single channel enabled. The fallbacks are untested. Change-Id: I3be7034ad25312b3ebf47a54f335a3893f8d7cc1 Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/14173 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>