I'm trying to port FreeBSD on ASUS WL500W board with BCM4704 chip. But CFE memory enumerator doesn't work, returns 0 bytes. But there is CFE environment variable with actual RAM size: CFE_MEMORYSIZE
This fix uses CFE_MEMORYSIZE if CFE memory enumerator doesn't work. Also it removes misleading outdated comment and print error code if debug is enabled.