bm_format

From ArchaicPixels: HuC and PCEAS Documentation

bm_format();    [ 1.5+ ]

    Format the whole backup ram.  Does not format if data is already formatted.

    Actually, data aren't erased but header data reports so. You should be able
    to find old data in the bram using raw reads in the backup ram bank but not
    through the usual HuC functions.

    Return backup ram status as defined in the huc.h file.