set_idata
set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK,
set_idata(idata[1], MMC_WRITE_MULTIPLE_BLOCK, 1, resp,
set_idata(idata[2], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);
set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK, 1, req, req_len);
set_idata(idata[1], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);