MMC_SPI_BLOCKSIZE
ones = kmalloc(MMC_SPI_BLOCKSIZE, GFP_KERNEL);
memset(ones, 0xff, MMC_SPI_BLOCKSIZE);
mmc->max_blk_size = MMC_SPI_BLOCKSIZE;
mmc->max_req_size = MMC_SPI_BLOCKSATONCE * MMC_SPI_BLOCKSIZE;