[Buildroot] No sound device

[Lex Nahumury]

Hello,

I am trying to build a linux image for the Orang Pi Zero using buildroot.

git clone https://github.com/buildroot/buildroot.git buildroot
make orangepi_zero_defconfig
make menuconfig (adding alsa and jack)
make

The build goes well and the board boots fine.

The SOC has an on-chip I2S audio codec.
However, there is no sound device detected.

# aplay -l
aplay: device_list:274: no soundcards found...

I have tried a different board Olimex Olinuxino A64 which also has an Allwinner SOC
with on-chip audio codec.
Same story; no sound card.

Am I missing some build setting in menuconfig?
I am new to buildroot and Linux internals in general so I appreciate any help.
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