On 2026-02-10, [email protected] wrote: > Greetings, > > I've just finished installing a new system, choosing systemd-boot > rather than grub. The handbook says that /etc/kernel/cmdline should > contain 'quiet splash', but that's clearly not the whole story so I > improvised.
(Speaking of what ends up being fed to linux, IIRCWOC* it can indeed be made shorter if the defaults are appropriate (I think I've used the kernel .config default commandline setting to set hibernation resume partitions and boot partitions before, for example.) * IIRC WithOut Caffeine > 'blkid | grep nvme0n1p5' shows this: > > /dev/nvme0n1p5: LABEL="RootFS" > UUID="7ab169d9-03cb-44ce-98f6-1955c2458a4c" BLOCK_SIZE="4096" > TYPE="ext4" PARTLABEL="root" > PARTUUID="aeb1b1eb-7995-44ac-84ad-0e999ff4459d" > > ...so I put this into /etc/kernel/cmdline: > > root=UUID=7ab169d9-03cb-44ce-98f6-1955c2458a4c quiet splash > > Then on rebooting, I get 'Cannot open blockdev' or similar. > > Should there be some punctuation in my command line? Or perhaps I > should have specified the PARTUUID instead of the device UUID. This is > one of the few places where the handbook doesn't show an example. > > I can't check online at the moment because the site's down. I know from experience that PARTUUID works at least for "MSDOS"/"MBR" partition tables. Now I have the faint recollection that there was some kind of id-based approach that required udev to be running - but maybe that'd be just the /dev path with ID. (In such cases, I think it'd have to be used with an initrd?) Or maybe it was only necessary for MBR partition tables and would still work with e.g. GPT? -- Nuno Silva
