If you want to build out-of-tree kernel modules, you will need:

• kernel headers (installed with apt)
• kernel sources in /usr/src (cloned from git)
• kernel config (from /proc/config.gz)
• some preparation of the sources (but you can avoid building it 😉)

 

# Install kernel headers
apt install -y linux-headers-legacy-rk35xx

# Install kernel source
cd /usr/src
git clone https://github.com/armbian/linux-rockchip.git
ln -nsf linux-rockchip linux-5.10.160-legacy-rk35xx
cd linux-rockchip
git checkout rk-5.10-rkr6

# Prepare kernel source
zcat /proc/config.gz >.config
yes | make olddefconfig
make prepare modules_prepare
cp /usr/src/linux-headers-$(uname -r)/Module.symvers .

 

If anybody needs the steps for the older 5.10.110 kernel, I have those as well.

 

They are a bit uglier - since the kernel source and header installation includes various garbage files , including binaries for non-arm64 platforms.  

If you have the steps for 5.10.110, I would greatly appreciate them!!!