You can use Device Tree Overlay feature to enable/disable some hardware functions without to recompile the kernel source code.

You can find the device tree overlays configuration in `/boot/env.txt` for VIM3.

# Device Tree Overlays
#   uart3           -- Enable UART3 (uart_C, GPIO Header PIN15 & PIN16)
#   pwm_f           -- Enable PWM_F (GPIO Header PIN35)
#   i2c3            -- Enable i2c3 (GPIO Header PIN22 & PIN23)
#   spi1            -- Enable SPI1 (GPIO Header PIN15 & PIN16 & PIN35 & PIN37), pwm_f need to be removed
#   os08a10         -- Enable OS08A10 Camera
#   onewire         -- Enable onewire bus (PIO Header PIN15)
#   disable-ts050   -- Disable TS050 LCD
#   m2x-eth         -- Enable M2X 100M ethernet. Note: 1G ethernet will be disabled.
#   otg-device      -- Enable USB OTG Device
overlays=uart3 pwm_f i2c3 os08a10

`uart3 pwm_f i2c3 os08a10` are enabled by default.

* If you want to disable `pwm_f` you can remove `pwm_f` in `overlays` node.

* If you want to enable `onewire`, you can add `onewire` to `overlays` node.

{% note info Note %}

You need to save the file `/boot/env.txt` and reboot the board to take effect.

{% endnote %}

There are some ready to use dtbo files, you can also add your own dtbos to enable or disable the peripherals.

The default dtbo files are stored in directory: `/boot/dtb/overlays/#BOARD#`

khadas@Khadas:~$ ll /boot/dtb/overlays/kvim3
total 40
drwxr-xr-x 2 root root 4096 Jan 29 11:13 ./
drwxr-xr-x 6 root root 4096 Jan 29 11:13 ../
-rw-r--r-- 1 root root  352 Jan 29 09:35 disable-ts050.dtbo
-rw-r--r-- 1 root root  223 Jan 29 09:35 i2c3.dtbo
-rw-r--r-- 1 root root  277 Jan 29 09:35 m2x-eth.dtbo
-rw-r--r-- 1 root root  472 Jan 29 09:35 onewire.dtbo
-rw-r--r-- 1 root root 1072 Jan 29 09:35 os08a10.dtbo
-rw-r--r-- 1 root root  345 Jan 29 09:35 pwm_f.dtbo
-rw-r--r-- 1 root root  447 Jan 29 09:35 spi1.dtbo
-rw-r--r-- 1 root root  225 Jan 29 09:35 uart3.dtbo

* Write your own device tree overlay file, for example `example.dts`:

/dts-v1/;
/plugin/;

/ {
    fragment@0 {
        target = <&i2c3>;

        __overlay__ {
            status = "okay";
        };
    };
};

This device tree overlay is to enable `i2c3`.

* Compile it to dtbo

khadas@Khadas:~$ dtc -I dts -O dtb -o example.dtbo example.dts
khadas@Khadas:~$ ls example.dtbo
example.dtbo

* Move the dtbo file to `/boot/dtb/overlays/kvim3`

* Edit `/boot/env.txt` to add in node `overlays`

* Reboot the board