Hi Jeremias!
I’ve gotten to the point where I’ve made my own image and placed it on a USB Drive which booted just fine. I then placed the image on a SATA SSD, but I am struggling to know where to begin to modify the default U-boot on the eMMC to support SATA.
When you say “modify” the U-Boot, do you mean the variables and general u-boot setup environment or actually changing rebuilding U-Boot itself from Yocto as described here?