Sound issues with the 5.10.x kernel (alsa)

[Ryutaroh Matsumoto]

> Turns out CONFIG_SND_BCM2835 is not set in arm64's defconfig ...
> Any other settings I need to enable to get audio working (at all)?

How about the following precedure?
1. apt-get install linux-config-5.10/sid
2. cd linux-kernel-source-directory
3. cp /usr/src/linux-config-5.10/config.arm64_none_arm64 .config
4. make oldconfig
5. make -j 4 bindeb-pkg

This should give almost the same config as the Debian kernel package.

Ryutaroh