Hey all,
I was under the impression that coreboot support for the Broadwell Chromebooks such as the new Chromebook Pixel was upstreamed but I am having trouble getting it to work. On startup the lightbar and keyboard backlight activate, but not the screen backlight. After about forty seconds, give or take a second or two, it shuts off. I initially guessed that this was an ME issue since I read that there is a killswitch if ME is missing but apparently that killswitch acts more in the half hour range, and after my second attempt I am sure it is not an ME issue. Regarding the lack of screen backlight, I am inclined to think that it is not a VGA BIOS issue but some error occurring before graphics are ever initialized.
I assume the process is not so different for Broadwell. Of course I remembered to ad-lib the board name and quadruple check that the binaries I extracted from the recovery image were not corrupted. On my first attempt a few months ago I followed the instructions more or less exactly, but on this second attempt I kept the VGA BIOS as 0406 instead of 0a06 and used the new make options for including the descriptor and ME during the build instead of adding it in after the build. I think at this point any chance of an unintentional error can be ruled out. Perhaps I am missing some small detail regarding the build settings specific to Broadwell?
Best,
Min