[coreboot] Porting Kabylake laptop

[Nico Huber]

Hi Chris,

On 25.06.2018 16:50, chrisglowaki at tutanota.com wrote:
> I have a Kabylake laptop with a Sunrise Point chipset, that I want to
> port to coreboot using the FSP blob. I have no coding skills, but can
> follow the Librem build coreboot script and use code from ports using
> FSP 2.0 (Librem 15v3, Google Kabylake Chromebooks, Kabylake RVP8) to
> create mainboard directory for the laptop with proper devicetree. The EC
> on the laptop is an ITE with no datasheet available. Is it possible to
> at least get the laptop to boot using some code from these ports + the
> FSP and then use console log to fix issues? Can bad code alone damage
> the laptop?

you can generally boot without a complete port. But you can also damage
the hardware if you are not careful. Beside the devicetree settings (pay
attention when it comes to the voltage regulator settings!), the GPIO
configuration should also match your board. You can try to boot without
GPIO configuration (it should be safe because the hardware has to expect
the reset defaults for the GPIOs). But *never* try to boot with a copied
GPIO configuration from another board.

Regarding the EC, you can learn a lot about its interface from the ven-
dor's ACPI implementation. Unless the board uses a lot of PnP interfaces
of the EC (unlikely for a modern laptop), the datasheet is usually not
helpful. What you really would need is documentation about the EC firm-
ware and its OS interface. And you'll likely not get that.

Hope that helps,
Nico