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config.txt

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Frank Bauernöppel edited this page Oct 29, 2017 · 4 revisions

config.txt is a config file on the boot partition, which is read during the boot process.

A convenient way to view/edit this file on a running RasPi is to mount the boot partition like this:

root@raspberrypi3:~# mount /dev/mmcblk0p1 /boot
root@raspberrypi3:~# vi /boot/config.txt

typical file content

We use the following command to display the file content in a normalized (alphabetically sorted lines) way:

root@raspberrypi3:~# cat /boot/config.txt | sort

Only the last few non-comment (#) and non-blank lines are important:

disable_overscan=1                                                                                                                          
dtparam=act_led_trigger=heartbeat                                                                                                           
dtparam=i2c1=on                                                                                                                             
dtparam=i2c_arm=on                                                                                                                          
dtparam=spi=on                                                                                                                              
dtparam=uart0=on                                                                                                                            
dtparam=watchdog=on                                                                                                                         
enable_uart=1                                                                                                                               
gpu_mem=128                                                                                                                                 
start_x=1

changing config.txt

After changing it, a reboot is necessary. Most changes can already be done before bitbake by editing local.conf.

explanation of settings and further reading

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