[coreboot] HP Pavilion 14 Chromebook - AKA Butterfly

[John Lewis]

Hello again coreboot folks,

I am trying to get the subject working with coreboot, and I can't seem 
to get any display, either with SeaBIOS or Grub2 payloads (although 
Grub2 does switch backlight on). I have output from USB debug, but the 
only obvious problem is not being able to write the MRC cache (which 
also happens on Lumpy and doesn't stop it from booting). Additionally 
there isn't any debug output from the payloads. How do I enable same, 
and have you any other thoughts as to how to move things forward? Please 
see attached.

Kind Regards,

John.