Raspberry Pi Asked by Mike C. on October 5, 2021
I need to know the default contents of the cmdline.txt file for a Raspberry Pi 4. I was following an old tutorial about setting up a gps module. The tutorial had me change the contents cmdline.txt. Only after I made the change and the RPi4 failed to boot did I realize the tutorial was for an older model Pi. There is an answer for this question here What is the default cmdline.txt?, however it is also for an older model Pi.
On my Pi 4, it's:
console=serial0,115200 console=tty1 root=PARTUUID=XXXXXXXX-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
Your PARTUUID will not be the same as mine (which is why I X'd it out). Instead, use:
cat /etc/fstab
Note the PARTUUID for the root partition (ext4) and that's the value you need to use.
Correct answer by Tim Campbell on October 5, 2021
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