[coreboot] Re: MEC1619 gpio access question (X230)

[Martin Kepplinger]

Am 14.03.2019 11:46 schrieb Nico Huber:
> Hi Martin,
>
> Am 14.03.19 um 10:19 schrieb Martin Kepplinger:
> > So, I'm looking into h8 EC access.
> >
> > Where does ec_set_bit(0x3a, 0) for audio-mute or ec_set_bit(0x3a, 6) 
> > for wwan-enable
> > come from (let's keep that as an example)?
>
> this uses a software interface that is defined by the program that runs
> on the EC, aka the EC firmware. The EC firmware exposes an address 
> space
> (usually up to 256B) for communication with the host firmware (e.g.
> coreboot). Usually, there is *no* relation to hardware registers.

Ok. Patrick, do you have any more details on the interface here, and 
what is
or isn't implemented in coreboot?

thanks

martin