From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guillaume Dargaud <dargaud@lpsc.in2p3.fr>
Date: Tue, 15 Apr 2008 10:35:36 +0200
Subject: [Buildroot] Creating a bootable filesystem image?
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	<326f33790804141009iadec986u91a1abbde904bbf1@mail.gmail.com>
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To: buildroot@busybox.net

I normally just use dd to transfer the filesystem image onto a larger one.
Say you have /dev/sdc2 which is 500Mb and rootfs.powerpc.ext2 which is 10Mb 
like in my case. I just do
dd if=rootfs.powerpc.ext2 of=/dev/sdc2

There may be some hidden problems with that, but I never ran into them. Even 
a subsequent chkdsk runs without errors (you'd assume it would at least tell 
you the free space is missreported).

If you really want an ext2 at a specific size, just do the opposite:
dd if=/dev/sdc2 of=- | bzip2 > test.ext2.bz2

You may be able to use a loopback mount to do this, but I haven't tried it.
-- 
Guillaume Dargaud
http://www.gdargaud.net/