range Pi User Manual Copyright reserved by Shenzhen Xunlong Software Co., Ltd
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5.3.
How to set DT overlays
LCD MIPI screen, eDP screen, and multiplexing functions such as
I2C/SPI/UART/PWM in 40pin are disabled by default in the dts of the kernel, and the
corresponding DT overlays need to be manually enabled to use.
The method of opening DT overlays in OPi OS Arch system is as follows:
1) First open the /boot/extlinux/extlinux.conf configuration file
[orangepi@orangepi-pc ~]$ sudo vim /boot/extlinux/extlinux.conf
2) Then open the corresponding configuration by adding FDTOVERLAYS
/dtbs/rockchip/overlay/xxx.dtbo in /boot/extlinux/extlinux.conf
Note that xxx.dtbo in FDTOVERLAYS /dtbs/rockchip/overlay/xxx.dtbo needs to
be replaced with the specific dtbo configuration, please do not copy it.
[orangepi@orangepi-pc ~]$ sudo vim /boot/extlinux/extlinux.conf
LABEL OPIOS ARM
LINUX /Image
FDT /dtbs/rockchip/rk3566-orangepi-3b.dtb
FDTOVERLAYS /dtbs/rockchip/overlay/xxx.dtbo #Configuration that needs to be
added
3) The storage path of xxx.dtbo in the OPi OS Arch image is as follows, please note that
not all dtbos under this path can be used.
/boot/dtbs/rockchip/overlay/
4) The DT overlays configuration that can be used by the development board is as
follows
Features on the development
board
Corresponding DT overlays configuration
Raspberry Pi 5 inch screen
rk356x-raspi-7inch-touchscreen.dtbo
40pin expansion interface -
I2C2
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