[Arm-netbook] Multi-channel audio support

[jonsmirl at gmail.com]

On Sat, Dec 31, 2011 at 11:59 AM, lkcl luke <luke.leighton at gmail.com> wrote:
> On Sat, Dec 31, 2011 at 4:39 PM, jonsmirl at gmail.com <jonsmirl at gmail.com> wrote:
>> On Sat, Dec 31, 2011 at 10:59 AM, lkcl luke <luke.leighton at gmail.com> wrote:
>>> On Sat, Dec 31, 2011 at 3:35 PM, jonsmirl at gmail.com <jonsmirl at gmail.com> wrote:
>>>> I went through the datasheet.
>>>>
>>>> The chip does not have:
>>>> 1) Intel HD audio support (not the same as AC97)
>>>
>>>  ah, remember that the datasheet is *not* the authoritative source.
>>> only the source code is truly authoritative as it implements
>>> everything.  take a look through the datasheet and see if you can find
>>> mention of "SATA" or "PATA" in it.
>>
>> I would like to know if the chip has Intel HD audio support.
>
>  i've mentioned that i may have seen an "audio" file in an "hdmi"
> directory, or possibly an "hdmi" file in an "audio" directory.  it was
> a fleeting glance however so you would have to double-check.

Intel HD Audio has nothing to do with HDMI. Intel HD audio is the next
generation of AC97. It would be a feature of the serial interface
hardware.


>
>
>> Nothing I am able to look at indicates that it has HD audio support.
>
>  the source code instructions are here:
> https://alioth.debian.org/scm/?group_id=100475
>  and a web interface here:
>  https://alioth.debian.org/scm/browser.php?group_id=100475
>
>  come on, john :)
>
>>>
>>>> 2) S/PDIF output
>>>>
>>>> It does have:
>>>> 1) Eight high def capable i2s channels (our embedded hardware uses this)
>>>> 2) Support for slave AC97 CODECs (not a high def solution)
>>>
>>>  ok, so again (apologies for pointing out that this is the 3rd time of
>>> asking, jon) - would placing the 8 pins of I2S/AC97 pins on the 44-pin
>>> expansion header be of assistance to you?
>>
>> No assistance.
>
>  ok.
>
>>  We do HD audio, AC97 is not HD capable.
>
>  understood.
>
>> We have to use
>> the eight I2S channels and will design our own PCB to get access to
>> them.
>
>  ok.... we may be talking about the same thing.  page 37 of the
> datasheet refers to pins on port PB.  port PB pins 5 through 12 are
> I2S when on multiplex function "2" but *some* of those exact same pins
> are AC97 *only* on multiplex function "3".
>
>  so.
>
>  if you are referring to the "eight I2S channels" as being the 8
> channel output of the single I2S bus which is pins PB5 through 12,
> then those 8 pins could be routed to the 8 spare pins of the 44-pin
> expansion header.
>
>  would _that_ help?
>
>  l.
>
>  p.s. it would, by a complete coincidence, also enable AC97 audio
> (which you don't need but others might, by selecting multiplex
> function 3 instead of 2 for those pins).
>
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-- 
Jon Smirl
jonsmirl at gmail.com