Re: [uml-user] MTD Devices

[Jonathan R. <fre...@ul...>]

On Fri, 24 May 2002, Shane Spencer wrote:

> Alo.
> 
> I am trying to get mtd device stuff to work with just the
> root_fs_debian_jffs2 on the sf download site

You are referring to the root_fs from the gbootroot project.
 
> What are the commands to do such..

The easy way to test a jffs/jffs2 filesystem is to open the Advanced Root
Section in gbootroot.  Then click on the middle button at the bottom
called UML, this brings up the UML Box.  In the MTD Emulator section click
on the "On or Off" check button, then select either mtdram or blkmtd.
Select the root_fs, in this case root_fs_debian_jffs2, and press submit. 

This will run the jffs2 root_fs on a simulated mtd device using either the
mtdram or blkmtd module.  There is a lot of output to watch as the initrd
does its magic an ultimately mounts the root_fs on the selected mtd
device. 

> I hope to get so involved in this that I will end up teaching myself enough
> about mtd to learn how to make embedded systems that automatically update
> their root images

Cool, this root_fs was created on an x86 machine, but I've never had the
good fortune to test it on a real x86 embedded device, and I'd be very
interested in the results you get. 

Incidently, you can create your own jffs2 root_fs from gbootroot, and for
updating I'd suggest apt-get upgrade|dist-upgrade assuming this is what
you are talking about.

Jonathan