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Message-ID: <48188AC2.70804@avtomatika.com>
Date: Wed, 30 Apr 2008 17:05:38 +0200
From: Branko Badrljica <brankob@avtomatika.com>
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Subject: Re: [gentoo-amd64] boot Gentoo from USB key
References: <1209537833.6170.62.camel@ws2912.agr.st.com> <481867A3.3070904@lakedaemon.net> <48188245.9010603@avtomatika.com> <4818866C.90109@lakedaemon.net>
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Jason wrote:
>
> initrd is exactly how you do it.  In the case of booting off of USB, 
> there are too many variables (drive detection order, different 
> hardware, etc) to handle on the kernel command line. An initrd gives 
> you the flexibility to solve these problems.
>
>> You could use initrd/initramfs, but seems like a lot of complications 
>> for little gain...
>
> I wouldn't call a portable, writable, boot from anywhere Linux OS on a 
> thumbdrive a trivial gain.  ;-)
>
> Jason.
>


But y<ou have the headache of interface at the old and new root across 
the pivot root. What happens if you execute something that was 
dynamically linked from intramfs and it decides to load and link another 
module with dlopen() from new root ? If you have that module and it 
belongs to the same version, then probably everything is fine. Otherwise 
it might not be.

Also, opened files and extra nodes in /dev during intiramfs phase tend 
to cause a headache or two...


Branko
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