[yocto] [meta-raspberrypi][question] how to setup alsa on rpi3?

[Tanu Kaskinen]

On Fri, 2016-10-21 at 13:45 +0200, Piotr Lewicki wrote:
> On 21.10.2016 13:26, Tanu Kaskinen wrote:
> > It looks like the default alsa device is configured to use card 0, but
> > card 0 doesn't exist. What do "cat /proc/asound/cards" and "ls -l
> > /dev/snd" print?
> 
> root at raspberrypi3:~# cat /proc/asound/cards
> --- no soundcards ---
> root at raspberrypi3:~# ls -al /dev/snd/
> drwxr-xr-x    2 root     root            60 Oct 21 09:53 .
> drwxr-xr-x   11 root     root         13200 Oct 21 09:53 ..
> crw-rw----    1 root     audio     116,  33 Oct 21 09:53 timer

Weird, is snd-bcm2835 actually loaded?

I don't have oe on rpi myself, so if there's some extra step required
to make alsa work, I don't know about it.

I have raspbian on rpi2, and /boot/config.txt contains this, which
seems relevant, so you could check if you have it:

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

But if you have snd-bcm2835 already loaded, then I don't think this can
be the issue.

> I wonder what is used by omxplayer that it works, but alsa does not.

Yes, it seems to be some kind of witchcraft.

-- 
Tanu