[coreboot] MEC1619 gpio access question (X230)

[Martin Kepplinger]

Hi,

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)?

On the X230, for example wwan-disable should be on GPIO23 (GPIO023 i 
guess).
In the mec1618 (ok different, but hopefully similar enough) datasheet I 
can't really
find the connection to coreboot's implementation here -.-

So there's the AHB Base Address 0xC400h right? Then for example there's 
the
4 bytes "GPIO[000:036] Input Register" at base+0x300. According to this 
"bit indexing example"
table, GPIO023 would be Bit 19 of those 4 bytes...

If so (?), how does that relate to ec_set_bit(0x3a, 6)? It all still 
totally unclear to me, but
I might get it all wrong :)

thanks a lot,

martin