[U-Boot] env: fix potential stack overflow in environment functions

[Wolfgang Denk <wd@denx.de>]

Dear Scott,

In message <1365203857.17535.16@snotra> you wrote:
>
> > Scott, Andy:  I think I remember that some architectures really _need_
> > LMB - can you please shed a bit ligh on which these are, and why?  And
> > why it is enabled everywhere?
> > 
> > Also, any information about the underlying design, intended memory map
> > etc. would be highly welcome.
>
> CCing Kumar, who added a lot of the lmb stuff -- but it looks like  
> ramdisk copying predated lmb.

Indeed it does.  It even predates U-Boot.  The question is what the
actual design of LMB is, i. e. why it is implemented the way it is.

Best regards,

Wolfgang Denk

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