How to run NPU test on Radxa Rock 3C?

#1

I’ve got Radxa Rock 3C board. The linux kernel is 4.19.193-4-rk356x (official Debian bullseye image).
As I got from this link I need to upgrade a kernel up to 4.19.193-25. There is no such kernel in a repository. Without it I’ve got an error while running NPU demo test:

Failed to open rknpu module, need to insmod rknpu driver!
Failed to open rknpu device!

Does anybody know how to upgrade the kernel to have this driver on?

Armbian for Rock 3A (unofficial build) with mainline kernel
#2
#3

As I got from /usr/src/linux-headers-4.19.193-4-rk356x/.config my kernel has such a config flag:

.#
.# RKNPU
.#
CONFIG_ROCKCHIP_RKNPU=y

If I try to run example with sudo I get the same result

rock@rock-3c:~/rknn_ssd_demo_Linux$ sudo ./rknn_ssd_demo model/RK356X/ssd_incept ion_v2.rknn model/bus.jpg
[sudo] password for rock:
resize 640 640 to 300 300
Loading model …
rknn_init …
E RKNN: [20:31:00.723] failed to open rknpu module, need to insmod rknpu dirver!
E RKNN: [20:31:00.723] failed to open rknn device!
rknn_init fail! ret=-1