Difference between revisions of "Rockpi4/dev/common-interface-with-kernel-5.10"

Revision as of 03:04, 7 June 2022

    ROCK Pi 4 >  Development >  Common interface with Kernel 5.10

Description

If you want to use i2c, spi, uart, pwm, etc, with Kernel 5.10 in ROCK Pi 4. You'd better follow these steps.

Install essential package

Install package rockpi4-dtbo

 sudo apt-get install -y rockpi4-dtbo

Modify file /boot/hw_intfc.conf. Add "#" to line "intfc:dtoverlay=console-on-ttyS2" and "intfc:dtoverlay=console-on-ttyS4".

 #intfc:dtoverlay=console-on-ttyS2
 #intfc:dtoverlay=console-on-ttyS4

UART

Modify file /boot/hw_intfc.conf. Set "on" to enable the optional hardware interfaces while set "off" to disable.

 intfc:uart2=on
 intfc:uart4=on

And add "#" to line "intfc:dtoverlay=console-on-ttyS2" and "intfc:dtoverlay=console-on-ttyS4".

 #intfc:dtoverlay=console-on-ttyS2
 #intfc:dtoverlay=console-on-ttyS4

but now, the uart2 can still be used as a debug port with system log. If you don't want to output kernel messages, you can disable it as follow.

Modify file /boot/extlinux/extlinux.conf.

 append earlyprintk console=ttyFIQ0,1500000n8 rw init=/sbin/init rootfstype=ext4 rootwait  root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89 console=ttyS2,1500000n8

Delete strings console=ttyFIQ0,1500000n8 and console=ttyS2,1500000n8 in this line.

 append earlyprintk rw init=/sbin/init rootfstype=ext4 rootwait  root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89