[coreboot] HP Pavilion 14 Chromebook - AKA Butterfly

Kyösti Mälkki kyosti.malkki at gmail.com
Sat Oct 19 06:06:03 CEST 2013

On 19.10.2013 00:42, John Lewis wrote:
>> Find attached my grub.cfg with both serial and usb consoles, also
>> enabling some debugging for USB storage there. You could possibly move
>> set debug="usb" before the insmods, but you may need to revert it before
>> using serial_usb0.
>> The easiest way is to use a desktop board booting to grub and have it
>> provide grub shell over serial terminal. Those would be the first five
>> lines. You can then copy-paste other commands while capturing all
>> communication to logfile to check for any handshake with the BBB.
>> Kyösti
> I'm unsure exactly what you mean. I thought that with the correct
> grub.cfg the grub output would just continue where the BIOS debug output
> finished i.e. going to the Beaglebone?
> I have tried a grub.cfg with just the first 5 lines and with just the
> usb relevant stuff, hoping I would get a grub prompt over the gadget
> tty, but to no avail.
> John.

This was a proposal for a setup for a mainboard with old-style serial 
port so you could debug why console using the gadget driver does not 
come up.

For further discussion on this particular topic, better address the GRUB 
mailing lists.


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