how can I determine the root device?

[Mike Frysinger]

On Wednesday 20 June 2007, Dallas Clement wrote:
> Does anyone know of a way to determine the root device from which the
> kernel has been booted?  I've heard of a utility called "rdev" which
> will do this.  Just wondering if something like this is included in
> busybox or if there is a way to determine this from files found in the
> proc filesystem or something...

rdev works by comparing the major/minor from stat("/") to the major/minor of 
the device nodes in /dev/

depending on what you want to do, /dev/root may also work
-mike
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