I can build out the Linux image, but I can't find any document for flashing these images....
For Android cases, all these flash script can be found under out/target/product/xxx/ dir, but for Linux, no such flash scripts.....
Take a look to the Getting Started web page that we have for our i.MX8M mini EVK board in the following page:
Get Started with the i.MX 8M Mini EVK | NXP
You can see the options for download the image through Linux or through a Windows Machine. In both cases you explain how to do it.