Bootlin's embedded Linux class is fantastic and will teach you how to do all of this--uboot setup, building a kernel and root fs, etc. All of the materials for

Bootlin's embedded Linux class is fantastic and will teach you how to do all of this--uboot setup, building a kernel and root fs, etc. All of the materials for the class are free downloads so if you're motivated you can read the slides and follow it all yourself. I highly recommend it: https://bootlin.com/training/embedded-linux/ https://bootlin.com/training/embedded-linux/