Re: Alsa Nvidia APU support

[James Courtier-Dutton <James@superbug.co.uk>]

Rick B wrote:
> Hi all,
>    I wanted to get some guidance and suggestions regarding the 
> possibility of support for the Nvidia NForce2 APU. I use the AC97 chip 
> under Alsa, but I realize at this time the Nforce2 APU is not supported 
> under Alsa. However, I'm wondering if there was any possibility that I 
> could somehow modify either the snd_intel8x0 module that the AC97 uses 
> or the snd_via82xx module, since that's what the Nforce2 APU is 
> recognised as, to use the APU and AC97 at the same time? As I have some 
> extra time on my hands, I am willing to try indepth to get the Nvidia 
> APU working under Alsa. If this simply isn't possible for one reason or 
> another, please let me know. If it is possible but with considerable 
> effort, please point me in the right direction. If you reply to this 
> post from the alsa-devel list please "reply to all" as I'm not 
> subscribed to that list. Below is the output of lspci that shows how 
> each chip appears on my system:
> 
> 00:05.0 Multimedia audio controller: nVidia Corporation nForce 
> MultiMedia audio [Via VT82C686B] (rev a2)
>    Subsystem: Asustek Computer, Inc.: Unknown device 0c11
>    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
>    Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR-
>    Latency: 0 (250ns min, 3000ns max)
>    Interrupt: pin A routed to IRQ 3
>    Region 0: Memory at e4000000 (32-bit, non-prefetchable)
>    Capabilities: [44] Power Management version 2
>        Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>        Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> 
> 00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 
> Audio Controler (MCP) (rev a1)
>    Subsystem: Asustek Computer, Inc.: Unknown device 8095
>    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
>    Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR-
>    Latency: 0 (500ns min, 1250ns max)
>    Interrupt: pin A routed to IRQ 5
>    Region 0: I/O ports at e000
>    Region 1: I/O ports at e400 [size=128]
>    Region 2: Memory at e4080000 (32-bit, non-prefetchable) [size=4K]
>    Capabilities: [44] Power Management version 2
>        Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA 
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>        Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> 
> Thanks in advance for any suggestions.
> 
>                   Rick B
> 

The reason there is no support in alsa is because their is no public 
documentation that will help.
You therefore need to reverse engineer the Nvidia APU.
The Via VT82C686B datasheet is public, and available 
here:http://www.alsa-project.org/~james/via/
As you can see, that does not help much at all with regard to APU 
programming.
It only covers the AC97 programming, and not the APU.

Cheers
James


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