While getting the 'subarg' of 'hwconfig' env variable in config_core_prefetch(), if no hwconfig variable is defined, below warning is received: WARNING: Calling __hwconfig without a buffer and before environment is ready Fix this by checking 'hwconfig' env variable. If not found return without further processing. Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com> Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com> Tested-by: Michael Walle <michael@walle.cc>