MR_LdSpanArrayGet
u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map);
arRef = MR_LdSpanArrayGet(ld, span, drv_map);
arRef = MR_LdSpanArrayGet(ld, span, map);
arRef = MR_LdSpanArrayGet(ld, span, map);
arRef = MR_LdSpanArrayGet(ld, span, local_map_ptr);