[usr/src/sys/arm/at91/at91_machdep.c:261]: (style) int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information.

Source code is

    return (1 << (cols + rows + banks + bw));

I don't know if this kind of machine is likely to be installed with
> 2Gb RAM, but maybe better code would be

    return (1L << (cols + rows + banks + bw));