SDMMC3 can‘t work

[WayneWWW]

For the booting from sd, you can check this post here to understand some concept.

Boot from external drive

Hello, I understand that there are lots of people asking about how to boot from external drive (e.g. usb/NVMe drive). And also lots of methods all around this forum. Thanks for everyone to share their steps to achieve that. This post is just to give some basic concepts about how jetson platform boots from external drive. And answer some frequently-asked questions. I believe every method shared on this forum uses the same idea but just in different forms. 1. Jetson is not able to “fully” b…

A brief answer to your question

can you directly use the flash.sh to refresh sdmmc3？

No, it cannot.