GPMC_PREFETCH_CONFIG2
reg->gpmc_prefetch_config2 = gpmc_base + GPMC_PREFETCH_CONFIG2;
gpmc_context->prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context->prefetch_config2);