Rock3/extlinux

The ROCK 3 system images use configuration file /boot/uEnv.txt.

Warning: Remember there is only one line including item "overlays=" in file /boot/uEnv.txt.

To enable I2C, PWM, SPI, UART, CAN, etc, please see RK3566/RK3568 Available Overlay (ROCK 3A, ROCK 3B, Radxa CM3) part of Device Tree Overlays

To enable I2C-2 (/dev/i2c-2), add item "rk3568-i2c2-m0" to the "overlays=" line.

 overlays=rk3568-i2c2-m0

To enable I2C-3 (/dev/i2c-3), add item "rk3568-i2c3-m0" to the "overlays=" line.

 overlays=rk3568-i2c3-m0

To enable PWM0-M0, add item "rk3568-pwm0-m0" to the "overlays=" line.

overlays=rk3568-pwm0-m0

The related directory /sys/devices/platform/fdd70000.pwm/pwm/pwmchip* will be created. And you can do the operation in the directory.

To enable PWM0-M0, add item "rk3568-pwm0-m1" to the "overlays=" line.

overlays=rk3568-pwm0-m1

The related directory /sys/devices/platform/fdd70000.pwm/pwm/pwmchip* will be created.

To enable PWM11-M1, add item "rk3568-pwm1-m1" to the "overlays=" line.

overlays=rk3568-pwm1-m1

The related directory /sys/devices/platform/fdd70010.pwm/pwm/pwmchip* will be created.

System default enable uart2-m0 (/dev/ttyS2) to be debug console.

 overlays=rk3568-fiq-debugger-uart2m0

If you want to enable uart2-m0 (/dev/ttyS2) to be normal console, modify item "rk3568-uart2-m0" to the "overlays=" line.

 overlays=rk3568-uart2-m0

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