SD_IO_CCCR_CISPTR
cisptr |= sdmmc_io_read_1(sf, SD_IO_CCCR_CISPTR + 0) << 0;
cisptr |= sdmmc_io_read_1(sf, SD_IO_CCCR_CISPTR + 1) << 8;
cisptr |= sdmmc_io_read_1(sf, SD_IO_CCCR_CISPTR + 2) << 16;