SDIO_CCCR_DRIVE_STRENGTH
SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
SDIO_CCCR_DRIVE_STRENGTH,
SDIO_CCCR_DRIVE_STRENGTH,