DMC

Hi.
I need to run FAN control on the Rock 3a board. But i don't have rk3568-pwm8-m0-fan.dtbo in boot/dtb-6.0.10-rk35xx/rockchip/overlay. I copied rk3568-pwm8-m0-fan.dtbo from 4.19.193-67-rockchip folder. This script applied on the start:
Applying kernel provided DT overlay rk3568-pwm8-m0-fan.dtbo 2698 bytes read in 52 ms (49.8 KiB/s)  
The /sys/devices/platform/fe6f0000.pwm folder is being created. I apllyed this commands:
root@rock-3a:~# echo 0 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/export root@rock-3a:~# echo 10000 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/period root@rock-3a:~# echo 5000 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/duty_cycle root@rock-3a:~# echo normal > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/polarity root@rock-3a:~# echo 1 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/enable # Turn on fan root@rock-3a:~# echo 0 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/enable # Turn off fan But there is no PWM on the FAN connector. I see 800 mV DC voltage on the PWM pinin the FAN connector. How I can run the FAN PWM?

I tried this out, and at first it didn't work. Then I reflashed the NVMe from the armbian image and restarted. Boom, works like a charm!

Version 20211222-edge with 5.16-rc6 kernel.
Added support for HDMI audio.

Ver 20211227-current kernel 5.16-rc6 for Station P2 (rk3568) and M2 (rk3566)

Fixed LAN2. (Station P2 )
Fixed the reboot and shutdown of the Sd card.
Added support for the on/off button. Now, after switching off, you do not need to pull the power supply out of the mains, just press the button on the P2 case. Also, the operating system turns off when the button is pressed briefly.

Radxa rock-3a github.com/catalinii

Added images 20211126-edge with 5.16 kernel  (work HDMI USB LAN) for Station M2.
 
https://disk.yandex.ru/d/W1tihbpELodXEQ