2)I have wired for SDMMC_VDD_EN.What change should I do in dtb for that.Where should I mention the gpio that I have wired.
I think you could refer to this topic. Actually this one almost resolved every sdcard image we’ve met.
And I think you should summarize how many issues you have here and what platforms they are using. Looks like you have issue on Nano and again on NX.
For the UHS-I case on Nano, please also check the speed info as you pasted for NX here.