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).
XFCE:
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
root
specifier. 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 usesPARTUUID
? 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 likedd
more difficult? - 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=tty1
→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 specifiedcmdline.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-existenttty3
? -
Plymouth,
quiet
, andsplash
: 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 aresplash
andquiet
for?
Questions re: Customizations
-
cgroup_enable=memory swapaccount=1
: I needed these to getdocker
to 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?
Thanks!