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.
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I vaguely remember the last time I used cmdline.txt was when some 4 years ago, setting up wheezy or jessie. From stretch on I never need to use cmdline.txt again. I have been playing with GSP without using cmdline.txt. You might like to check out how set up GPS modules. (1) raspberrypi.stackexchange.com/questions/113544/… (2) raspberrypi.stackexchange.com/questions/113057/… (3) raspberrypi.stackexchange.com/questions/98840/…。 Cheers.– tlfong01Commented Jul 14, 2020 at 14:08
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1 Answer
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.
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Your
PARTUUIDends with-02, but I'm assuming that's gonna be the partition where root is. For me that's-03. I initially did the mistake of usinglsblk -o UUID,NAME, and took me a while to realize this was supposed to bePARTUUIDand not onlyUUID.– mazunkiCommented Sep 24, 2021 at 20:09 -
my question is - if the PARTUUID is incorrect, how to find out the correct one so that it can be edited from a Windows OS?– RebroadCommented Oct 2 at 13:54