ALC256 datasheet

[Andy Pont]

Hello all,

A bit of a long shot… does anyone have a datasheet for the ALC256 HDA 
audio CODEC?

I know that the device exists as I have some boards with it on (that I 
am working on a Coreboot port for) on my desk but a look on the Realtek 
website doesn’t yield anything.

Thanks,

-Andy.

[Marc Jones]

Check out the linux source for some tips. It looks like the alc256 is a
alc269 variant, so expect the register space to be similar. If you can,
dump the verbs etc from linux.

Marc

On Fri, Nov 6, 2020 at 6:55 AM Andy Pont  wrote:
> Hello all,
>
> A bit of a long shot… does anyone have a datasheet for the ALC256 HDA
> audio CODEC?
>
> I know that the device exists as I have some boards with it on (that I
> am working on a Coreboot port for) on my desk but a look on the Realtek
> website doesn’t yield anything.
>
> Thanks,
>
> -Andy.
>
> coreboot mailing list -- [e-mail]
> To unsubscribe send an email to [e-mail]

[Andy Pont]

Marc wrote...
> Check out the linux source for some tips. It looks like the alc256 is a 
> alc269 variant, so expect the register space to be similar. If you can, 
> dump the verbs etc from linux.

I have the datasheet for several of the ALC26x variants along with the 
verb table dumped from Linux.  I’ve started from there and hopefully it 
will be enough to get me through!

-Andy.

[Benjamin Doron]

Hi,
If the verbs are not enough, you might want to try searching for the
azalia function reset verb in the vendor firmware, using UEFITool, for example.
I know of at least my laptop, as well as one or more Thinkpads, that needed the
additinal verbs there (not in Linux's "init_pin_verbs") to get the headphone jack
working.

Good luck,
Benjamin