Hi Mahendran,
All the code in the SDK which you downloaded from nxp official website, you can use it, it's no problem.
If you just want to use the SD and MMC driver, not the usb code, I suggest you use the middleware driver, take K64 sdk as an example, you can find the sdmmc driver from this folder:
SDK_2.2_TWR-K64F120M\middleware\sdmmc_2.1.2
Please check you SDK package.
Wish it helps you!
Have a great day,
Kerry
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