Difference between revisions of "Rockpi4/dev/use-uart2-as-application-uart"
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Revision as of 08:36, 7 June 2022
ROCK Pi 4 > Development > Use UART2 as Application UART
Description
If you want to use uart with Kernel > 5.10 in ROCK Pi 4. You can follow these steps.
Install essential package
sudo apt-get install -y rockpi4-dtbo
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"
#intfc:dtoverlay=console-on-ttyS2 #intfc:dtoverlay=console-on-ttyS4
by 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