Today I learned: some ThinkPad X220 Tablet machines have WSON8 flash ICs.

This X220T now has a Winbond W25Q128FVSIG installed.

X220 vs X230 is an interesting case, because they both support these configurations: 8, 8+4 or 16, with 8+4 meaning that the 2nd IC footprint is used (unpopulated in these pics).

In single-IC configuration (8MB) as seen on X220/X220T, upgrading to 16MB is much easier.

I'm about to test a 16MB libreboot ROM on this. If it works, fantastic!

(this is my personal X220T)