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Date: Mon, 07 Dec 2009 12:29:38 +0100
From: Rolf Nielsen <listreader@lazlarlyricon.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: root partition too small
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alexs@ulgsm.ru wrote:
> Label from freebsd sysinstall in auto mode, make root partition 500mb
> For update OS (kernel + kernel.old) need about 700mb
> 
> Howto rebild kernel with litsted in kldstat modules? 
> 

In your kernel config file, use

makeoptions MODULES_OVERRIDE="<the modules you need>"

E.g.

makeoptions MODULES_OVERRIDE="atapicam zfs geom_eli geom_journal"

will build only the atapicam, zfs, geom_eli and geom_journal modules.
To save even more space, you could remove the

makeoptions DEBUG=-g

This will prevent debug symbols for kernel and modules from being installed.

If that isn't enough, have a look at the src.conf(5) man page, for a 
list of options that let you choose what parts of the userland to install.

Cheers,

Rolf Nielsen