gpmc_cs_request
status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
EXPORT_SYMBOL(gpmc_cs_request);
ret = gpmc_cs_request(cs, resource_size(&res), &base);
extern int gpmc_cs_request(int cs, unsigned long size, unsigned long *base);