From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
To: Mildred Frisco <mildred.frisco@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: making a linux kernel with no root filesystem
Date: Thu, 21 Oct 2004 14:53:22 +0300
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On Thursday 21 October 2004 12:46, Mildred Frisco wrote:
> Hi,
> I would like to ask help in compiling a minimal linux kernel. 
> Basically, it would only contain the kernel andno filesystem (or
> probably devfs).  I would only have to boot the kernel from floppy.
> Then after the necessary kernel initializations, I would issue a
> prompt where I can either shutdown or reboot the system. That's the
> only functionality required.  As I've learned from the init program
> (and startup scripts), the init services and shutdown commands are
> called from /sbin. However, I do not require to mount the root fs
> anymore.  I also tried to search for the source code of the shutdown
> program but I can't find it.  Please help on the steps that I should
> do.

Okay please imagine that kernel initialized all hardware and,
now, what shall it do instead of mounting root fs and starting
$INIT?

You want a "prompt where I can either shutdown or reboot the system".
How to do that? It is best done from small userspace environment,
like initrd or initramfs. Putting this into kernel is ugly.
--
vda

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