[systemd-devel] Scheme: Linux startup process with systemd

[ScotXW]

On 11/04/2013 11:55 PM, Jan Engelhardt wrote:
> On Monday 2013-11-04 23:48, ScotXW wrote:
>
>> Hi,
>>
>> I created this [1] scheme. Can you help fill in the blank? I know there is very
>> extensive documentation about systemd, it is way too extensive for my purposes,
>> the home user.
>>
>> [1] https://commons.wikimedia.org/wiki/File:Linux_startup_process_wip.svg
>
> Seems rather strange to find GRUB and Linux in "BIOS".
> And if you talk about Uboot and Redboot and whatever else, then
> marking the orange section as "GRUB" is sorta outta place.

Linux kernel and GNU GRUB can be payloads to coreboot. That is why they 
are on that level in their own color.
However, the y-axis is the time from the connection to power. Does it 
make more sense now?

The distinction of GNU GRUB is shurely important in a scheme about the 
start up process. It is the bootstraploader.

> It's also wrong on so many accounts.
> -initramfs is not mounted, because it is not a filesystem.

AFAIK ramfs = ram file system, so I assumed it is being mounted. How 
else to epress it? Was initrd "mounted", is that at least correct? Will 
tmpfs be "mounted"?

> -kernel does not execute /usr/bin/systemd but /init from the initramfs,
> or in case none was used, /sbin/init.

Hö? You lost me.

> -/usr/lib/systemd/system is a directory, not an executable entity
So "system processes the declarative files in /../"?

> -you already have systemd, so having systemd again in "user interfaces"
> is sort of inside out

Yeah, there is alink missing between them, because systemd gets startet 
and then remains available as a daemon.

Regards,
ScotX