SDMMC_BLOCK_SIZE
cache_dcbf(buf, nblks * SDMMC_BLOCK_SIZE);
cache_dcbi(buf, nblks * SDMMC_BLOCK_SIZE);
if ((size % SDMMC_BLOCK_SIZE) != 0) {
size / SDMMC_BLOCK_SIZE, buf);
static uint8_t sdmmc_buf[SDMMC_BLOCK_SIZE];