question about ALSA devices not showing up in buildroot build

[Pavel Hofman]

Dne 02. 02. 21 v 19:32 Bert Schiettecatte napsal(a):
> Hi Pavel
>> Do you have the /usr/share/alsa configs?
> 
> [root at rockchip:/usr/share/alsa]# ls -las
>       1 drwxr-xr-x    6 root     root          1024 Dec 21  2020 .
>       1 drwxr-xr-x   24 root     root          1024 Jan 23  2021 ..
>      10 -rw-r--r--    1 root     root          9876 Dec 21  2020 alsa.conf
>       2 drwxr-xr-x    2 root     root          2048 Dec 21  2020 cards
>       1 drwxr-xr-x    2 root     root          1024 Dec 21  2020 init
>       1 drwxr-xr-x    2 root     root          1024 Dec 21  2020 pcm
>       1 drwxr-xr-x    2 root     root          1024 Dec 21  2020 speaker-test
> [root at rockchip:/usr/share/alsa]#
> 

Sometimes strace has been of help to me, to see which file is being 
tried to open:

strace aplay -L 2>&1 | grep 'open('

The PCM devices are defined in the pcm/ and cards/ configs, with help of 
/usr/share/alsa/cards/aliases.conf . Maybe for your new driver no config 
is being used, but I think even an unknown card should have the very 
basic PCM devices defined.

Pavel.