When testing the latest coreboot code before the 4.14 release, I found I couldn't build a working image with the default (or what I usually use) config for the asus/p2b. I figured out that it failed to build with an error of not enough space in cbfs after the merge to enable bootblock console for intel 440bx. Following this, I just disabled microcode firmware to free up space and it worked fine, even without the microcode update. Specifically selecting the microcode for the cpu I'm using would probably be better though. I'm just commenting on my findings, not really expecting anything. I had intended on trying to obtain some larger flash chips yet, though I never got around to it. It would still leave a broken default build config though with the standard rom size.