[U-Boot] Can I read env from RAM in uboot script?

[John Stile]

On Sat, 2013-01-26 at 08:41 +0100, Wolfgang Denk wrote:
> Dear John Stile,
> 
> In message <1359165410.7974.114.camel at genx> you wrote:
> > Is it possible to have uboot read it's environment from a RAM address,
> > rather than NAND?
> > OR
> > Can uboot's scripting support load variables from a RAM address?
> 
> Yes, all this can be done.  And easily.  See for example the
> "env import" command.
> 
That is a great idea.
What version of uboot introduced 'env import'?
I'm stuck on u-boot-1.3.4.
Is there a patch?