How to enable NPU in rockpi 3C?

#1

Rock 3C has 0.8T NPU functionality, how can i enable it in offical debian11 image?

#2

Currently NPU is not supported in ROCK 3C, so please follow the below recording to enable the overlay manually:

https://asciinema.org/a/AXY7ii5JGv3JGSZrjUFgm3uIQ

We will update the overlay, so it will be shown in rsetup for easy management.

#3

After run the following commands, the system can’t boot up, the blue indicated LED is not lighted.
$ sudo cp /usr/lib/linux-image-4.19.193-4-rk356x/rockchip/overlays/rk3568-npu-enable.dtbo /boot/dtbo
$ sudo u-boot-update
$ grep overlay /boot/extlinux/extlinux.conf
fdtoverlays /boot/dtbo/rk3568-npu-enable.dtbo
fdtoverlays /boot/dtbo/rk3568-npu-enable.dtbo
$ sudo reboot

#4

If you comment the new added lines (#fdtoverlays /boot/dtbo/rk3568-npu-enable.dtbo) in /boot/extlinux/extlinux.conf, and reboot again, the system recovery as before.

#5

Your system must be the 1GB version then. NPU is only supported with at least 2GB memory IIRC. The above command was tested on a 4GB 3C. This is why the NPU was not enabled initially.

#6

Please try again with system installed on a microSD card. I hit the kernel panic when I tried to boot from eMMC even on my 4GB 3C.

#7

My system is booted from SD card, the fault is easily to reproduce.