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From: Nick Hibma <nick@van-laarhoven.org>
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Cc: Andriy Gapon <avg@icyb.net.ua>
Subject: Re: booting/loading a tool, not kernel
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You are aware of nextboot(8)? That you could use to specify the 'kernel' to 
load on next boot.

Also boot.config(5) might be of use.

Nick

> I'd like to add an entry to my loader menu to load/execute memtest86
> instead of a kernel. It is built as standalone ELF executable, of course.
>
> Currently I go to a loader prompt and do:
> > unload
> > load /boot/memtest86
> > boot
>
> Where should I look to get this into the forth code?
>
> Suppose I want to extend this approach.
> What would be a good name for subdirectory to put such tools?
> What would be a good way to add a sub-menu for such tools?
>
> Also, my current approach means that loader still first loads a standard
> kernel and its modules and then replaces them with memetest86. How to
> get to a loader menu without pre-loading anything?