[MinnowBoard] How to support RealTek ALC262 Codec Support connected to Intel HDA bus in MinnowBoard 0.82 firmware?

[Berth-Olof Bergman]

Hi,

The Minnowboard Max doesn’t connect the HDAUDIO. Only the LPAUDIO is connected. HDAUDIO and LPAUDIO always share the codec, so you can not used both of them. As the firmware is for Minnowboard Max that doesn’t use HDAUDIO the codec is used by LPAUDIO.

The BIOS does not need to do anything with the codec. It sufficient to enable and enumerate the PCI devices. Linux is perfectly capable of detecting and initializing the codec. I suggest you rebuild the firmware and disable LPAUDIO. Make sure HDAUDIO is enabled. Then it should work.

Best regards,

B-O Bergman
Winzent Technologies


> 11 aug 2015 kl. 07:32 skrev Gerard Bucas <gerard.b at tekmagic.net>:
> 
> Hi experts!
> 
> We have an Intel Atom Baytrail SoC (E3845) based board which has a Realtek
> ALC262 audio codec connected to the Intel HDA bus. We used the 0.82
> MinnowBoard MAX firmware as our starting "BIOS" and modified it to support
> SODIMM's etc. We are using yocto built linux and Ubuntu as test OS's. Both
> run well & are stable. HDA audio works (directed to HDMI).
> 
> However, our linux kernel does not "see/detect" the Realtek AudIo codec on
> this board, whereas it does on other boards that have a similar setup using
> a different BIOS. So I need some help with understanding how/what we need to
> modify in the minnowMax firmware to support this ALC262 codec connected in
> this way. 
> 
> I am a little confused as to what the BIOS/firmware does versus what the
> linux kernel does to detect and initialize the device. I would have thought
> that all detection and initialization of the ALC262 is done by the linux
> kernel (assuming the correct drivers are included - which is the case) as
> opposed to the (edk2/MinnowMAX based uefi firmware/BIOS)? So it seems I am
> missing some fundamental concept in understanding "who does what" (firmware
> versus OS kernel)?
> 
> Would really appreciate some input on this and some pointers as to how to
> add the right support at the right level!
> 
> Thanks & Regards
> 
> Gerard
> 
> 
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