You could (well couldnt, all listed out of stock) have this, or Lenovo X220 with IPS screen Edit: with 8GB ram and 32GB mSata SSD, still <240Euro.

But an X220 wouldn't be open-source. That's kind of missing the entire point.

it would with coreboot

besides Allwinner A64 = tons of binary blobs, often containing gpled code and openly violating open source licenses