that's why i was so excited when i found the Ingenic M150... and so disappointed when they told me they'd stopped making it. why? because the M150 has 128mb of DDR2 RAM *on board* the same 11x11mm package, as a Multi-Chip-Module.
Hmm... this reminded me of Next Thing Co.'s GR8 processor. It has a 14x14mm package with 256mb ram built in. I'm not sure they meet the libre requirements but it is worth a look (if you haven't seen it already): https://nextthing.co/pages/chippro