systemd question

[Bill Nottingham]

Tom Horsley (horsley1953 at gmail.com) said: 
> I've been fooling with the systemctl (unfortunately similar
> to the sysctl name) tool, and I see "units" for all the
> devices on my system with long names something like
> sys-pci-yadda-yadda.device.
> 
> I have occasionally wanted the ability to make some bit
> of hardware on my system disappear. Don't want linux to
> fool with it at all (but don't want to take it apart
> and yank the board either :-).
> 
> Can I use systemctl to do this? Essentially disable
> some device unit so the system won't try to use that
> bit of hardware for anything?

To the best of my knowledge, no. Those are populated in systemd via udev.

> Just curious. (Of course what I really want is probably
> something at a much lower level - something like a
> kernel command line parameter that would make the
> initial device enumeration skip the device entirely
> as early in the boot process as possible).

rd.driver.blacklist=<driver>

Bill