Rockpi4/dev/common-interface-with-kernel-5.10 - Revision history

Stephen at 03:13, 7 June 2022

2022-06-07T03:13:28Z

Stephen at 03:12, 7 June 2022

2022-06-07T03:12:15Z

Stephen at 03:04, 7 June 2022

2022-06-07T03:04:33Z

Stephen: Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/common-interface-with-kernel-5.10}} ROCK Pi 4 > Development > Rockpi4/dev/common-interface-w..."

2022-06-07T03:03:45Z

Created page with "{{rockpi4_header}} {{Languages|rockpi4/dev/common-interface-with-kernel-5.10}} ROCK Pi 4 > Development > Rockpi4/dev/common-interface-w..."

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[[rockpi4 | ROCK Pi 4]] > [[rockpi4/dev | Development]] > [[Rockpi4/dev/common-interface-with-kernel-5.10 | 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-ttyS2"

#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"

#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

@@ Line 39: / Line 39: @@
   append earlyprintk rw init=/sbin/init rootfstype=ext4 rootwait  root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89
-Please note that when ROCK Pi 4 uart2 is connected with your devices like GPS, Raspberry Pi CAN/RS485 hat, etc, please do the following step.
+Please note that when ROCK Pi 4 uart2 is connected with your devices like Raspberry Pi CAN/RS485 hat sending some data to uart2 on ROCK Pi 4. Please do the following step.
 Check the file /boot/extlinux/extlinux.conf. And delete the following line.
   menu title select kernel

@@ Line 13: / Line 13: @@
 Install package rockpi4-dtbo
-  sudo apt-get install -y 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-ttyS2
-  #intfc:dtoverlay=console-on-ttyS4
+ #intfc:dtoverlay=console-on-ttyS4
 ==== UART ====
@@ Line 24: / Line 24: @@
 Modify file /boot/hw_intfc.conf. Set "on" to enable the optional hardware interfaces while set "off" to disable.
-  intfc:uart2=on
+ intfc:uart2=on
-  intfc:uart4=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-ttyS2
-  #intfc:dtoverlay=console-on-ttyS4
+ #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
+ 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
+ append earlyprintk rw init=/sbin/init rootfstype=ext4 rootwait  root=UUID=8650cdca-49b0-4431-9667-5c639f6bab89