YAMON on all devboards provides the "memsize" envvar; in the unlikely
case that it can't be parsed just assume 64MB, which all boards have
at least.
Signed-off-by: NManuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3286/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>