[Grml] About grml bootid

[T o n g]

Hi,

Can somebody explain the newly introduced bootid option? 

I know, 

bootid is used "for verifying the ISO through bootid=.... bootoption"
and the logic behind bootoptions and possible combinations:

* bootid.txt + wrong bootid=...                    => fails to boot
* bootid.txt + right bootid=...                    => boots
* bootid.txt + ignore_bootid                       => boots
* bootid.txt + no bootid=... + no ignore_bootid    => fails to boot
* no bootid.txt + no bootid=... + no ignore_bootid => boots
* no bootid.txt + bootid=...                       => fails to boot
* no bootid.txt + ignore_bootid=...                => boots

I mean to ask,

- what exactly does the bootid stand for?
- how does the file /conf/bootid.txt generated?
- how would bootid work with integrating multiple-grml on the same USB?

Is there somewhere to read more about it?

Thanks

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