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Date: Wed, 14 May 2014 09:11:00 +0400
From: Ruslan Bukin <br@bsdpad.com>
To: Maxim Ignatenko <gelraen.ua@gmail.com>
Subject: Re: Keyboard drivers, polling vs. non-polling mode
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On Tue, May 13, 2014 at 11:17:58AM +0100, Maxim Ignatenko wrote:
> I keep getting "fdb0: i2c transfer returned 6" and none of the printfs
> I've added to iicbus_transfer_gen in sys/dev/iicbus/iiconf.c.

You have problems with communication to EC.

Forget about keyboard for a while and check i2c CS (chip select) and/or 
EC arbitration pins. Something is definitely goes different in HP
implementation of Chromebook. Probably they used different GPIO pins.

-Ruslan