[coreboot] HP Pavilion 14 Chromebook - AKA Butterfly

Kyösti Mälkki kyosti.malkki at gmail.com
Thu Oct 17 20:49:27 CEST 2013

On 17.10.2013 19:45, John Lewis wrote:
> 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.


That log was with SeaBIOS? With it one usually executes video bios late. 
With Grub2 video bios is usually executed early, before payload.

Your log indicates it did not even reach payload. Try to add some 
debugging printk's in smbios_write_tables() to trace where it might 
halt. Unfortunately you cannot yet use GDB over usbdebug.

Grub2 console over Net20DC has been demonstrated, it may require some 
tweaks to USB IDs/descriptors to make it work with BeagleBone Black.


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