https://www.microchip.com/en-us/development-tool/linux4sam.o...
With well made compute modules: https://www.digikey.com/en/products/detail/microchip-technol...
And open reference designs that fit on 4-layer boards (!!!!) despite using DDR2. Though I think most people would be more comfortable with 6-layer boards (which is possible with OSHPark today).
https://www.microchip.com/en-us/development-tool/linux4sam.o...
With well made compute modules: https://www.digikey.com/en/products/detail/microchip-technol...
And open reference designs that fit on 4-layer boards (!!!!) despite using DDR2. Though I think most people would be more comfortable with 6-layer boards (which is possible with OSHPark today).