I’ve got some questions about what’s going on these files across different flavors of Manjaro ARM. I’ve added line returns for readability, but the
cmdline is, of course, a single file.
Regarding any differences, unless stated otherwise, I didn’t change any defaults during my second install (the minimal install).
root=LABEL=ROOT_MNJRO rw rootwait console=ttyAMA0,115200 console=tty1 selinux=0 plymouth.enable=0 smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 kgdboc=ttyAMA0,115200 elevator=noop usbhid.mousepoll=8 snd-bcm2835.enable_compat_alsa=0 audit=0 cgroup_enable=memory swapaccount=1 fsck.mode=force fsck.repair=yes
Minimal, Fresh Install:
root=PARTUUID=6207adc9-02 rw rootwait console=serial0,115200 console=tty3 selinux=0 quiet splash plymouth.ignore-serial-consoles smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 kgdboc=serial0,115200 elevator=noop usbhid.mousepoll=8 snd-bcm2835.enable_compat_alsa=0 audit=0
Questions re: New Defaults:
root: The XFCE version uses a LABEL for the
rootspecifier. I remember this being explicitly done a few versions ago for ease of … something … I’m a bit fuzzy on the exact reason and can’t find the post from @Strit right now. Is there a specific reason the newer install uses
PARTUUID? it seems like that would make transferring the install from one disk to another (e.g., from an SD card to a USB drive), or restoring from a full disk backup with a tool like
- serial0: I’m pretty sure this relates to this note from @Darksky re: bluetooth support: New Raspberry Pi Kernels & Related Packages - #344 by Darksky ?
console=tty3: What does this do, and why did the tty change? I tried to google, but google flooded me with results re:
config.txt, even though I specified
cmdline.txt, so that was … thoughtful of it. I did notice that I don’t get a bunch of scrolling output on an HDMI monitor when the device is powering on. Is that because these messages are being output to the non-existent
splash: Not enabled on the XFCE install, but enabled here? I think this does the splash screen, and further is commanded to “ignore serials consoles” so as not to spam connected TTYs? But if that’s the case, what are
Questions re: Customizations
cgroup_enable=memory swapaccount=1: I needed these to get
dockerto see and use cgroups correctly. They never caused any issues, but I’m curious if they’re not part of the default command for a specific reason?
- fsck.mode=force fsck.repair=yes: In the course of experimenting with my XFCE Pi, which I can only access over SSH, I ended up crashing it hard enough that I couldn’t order a reboot via SSH anymore. Several times. I added these to make sure it automatically checked the SSD boot device and conducted repairs caused by any hard reset, to try to prevent corruption. Is this actually a good idea? Am I doing more harm than good?