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+Openwrt inside a user mode linux.  Why would we even want this many ask?
+
+There are potentially a lot of reasons, one obvious one to me, it allows
+folks to 'kick the tires' without actually flashing up any hardware.  It's
+also a great environment for porting over packages, you can get a package
+fully functional in the uclibc root environment inside a uml without actually
+disturbing your 'real router', and then rebuild for a specific target once
+it's fully tested.
+
+This is a first stab at a build that 'just works' and there will be more
+cleanup to come.  The simple directions are:-
+
+Configure for uml target
+Configure with an ext2 root file system
+build it all
+
+In your bin directory you will find a kernel and an ext2 root file system
+when it's finished.  Just run it like this:-
+
+bin/openwrt-uml-2.6-vmlinux ubd0=bin/openwrt-uml-2.6-ext2.img con=null ssl=null ssl0=fd:0,fd:1 con0=null,fd:1
+
+The uml will start, and eventually the serial console of the uml will be at your
+console prompt.  If you would like it in xterms, substitute con=xterm and con0=xterm.
+No networking is configured, but, it's a starting point.  The resulting file system
+has just enough free space to start kicking the tires and playing in the world of
+'embedded routers' along with all the resource restrictions that come with that
+world.  
+
+To configure networking and more, refer to the user mode linux documentation online.
+A quick start goes along this line.  install the uml-utilities packages so you have
+the uml switch in and running, then add a command param to your uml start like this
+
+eth0=daemon,00:01:01:01:01:01,unix,/<your uml switch control socket here>
+
+With that in, and uml networking actually functional (can be a challenge at times),
+you should be able to ifconfig the interface and talk to the host side, or, if you
+bridged the uml switch to your host network, you should be able to run udhcp and be
+away with networking off to the world.  Again, if you are unfamiliar with uml and
+uml networking, please read the docs and how-to stuff available on the net.  It does
+take some fiddling to get it started and working right the first time, but after that,
+it opens up a whole new world of virtual machines.
+
+
+
+http://user-mode-linux.sourceforge.net/