Difference between revisions of "Rock3/extlinux"
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=== <span id="common_hardware_interface">Common Hardware Interfaces, I2C, PWM, SPI, UART, CAN, etc</span> === | === <span id="common_hardware_interface">Common Hardware Interfaces, I2C, PWM, SPI, UART, CAN, etc</span> === | ||
| − | + | This page teaches how to enable overlays in file '''/boot/extlinux/extlinux.conf'''. The directory '''/dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/''' includes overlays you can enable, to enable overlay, we just need add an absolute path of overlay after the key word '''fdtoverlays''', there is a space between each overlay and a space between '''fdtoverlays''' and overlay's absolute path, for example, | |
| + | fdtoverlays /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-fiq-debugger-uart2m0.dtbo /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-disable-npu.dtbo /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-spi3-m1-cs0-spidev.dtbo | ||
| − | ''' | + | The examples above indicates that '''rk3568-fiq-debugger-uart2m0''' and '''rk3568-disable-npu''' and '''rk3568-spi3-m1-cs0-spidev''' and are enabled |
To enable I2C, PWM, SPI, UART, CAN, etc, please see '''RK3566/RK3568 Available Overlay (ROCK 3A, ROCK 3B, Radxa CM3)''' part of [[rock3/Debian/device-tree-overlays | Device Tree Overlays]] | To enable I2C, PWM, SPI, UART, CAN, etc, please see '''RK3566/RK3568 Available Overlay (ROCK 3A, ROCK 3B, Radxa CM3)''' part of [[rock3/Debian/device-tree-overlays | Device Tree Overlays]] | ||
Revision as of 03:55, 8 November 2022
Contents
Common Hardware Interfaces, I2C, PWM, SPI, UART, CAN, etc
This page teaches how to enable overlays in file /boot/extlinux/extlinux.conf. The directory /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/ includes overlays you can enable, to enable overlay, we just need add an absolute path of overlay after the key word fdtoverlays, there is a space between each overlay and a space between fdtoverlays and overlay's absolute path, for example,
fdtoverlays /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-fiq-debugger-uart2m0.dtbo /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-disable-npu.dtbo /dtbs/4.19.193-53-rockchip-gc36f859f0a63/rockchip/overlay/rk3568-spi3-m1-cs0-spidev.dtbo
The examples above indicates that rk3568-fiq-debugger-uart2m0 and rk3568-disable-npu and rk3568-spi3-m1-cs0-spidev and are enabled
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
I2C
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
PWM
PWM0
Option 1: PWM0-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.
Option 2: PWM0-M1
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.
PWM1
PWM1-M1
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.
SPI
UART
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
CAN
I2C
PWM
SPI
UART
CAN