[U-Boot] U-boot env variables parsing

[Joakim Tjernlund]

Wolfgang Denk <wd at denx.de> wrote on 2010-04-01 15:05:29:
>
> Dear Joakim Tjernlund,
>
> In message <OF6D501B3A.40F7E6A2-ONC12576F8.00466BE2-C12576F8.
> 00471566 at transmode.se> you wrote:
> >
> > > I don't think you ever posted this before. I cannot find any trace of
> > > such a patch - not in the public archives nor locally.
> >
> > I think I did, but this would have been late 2001 or 2002 I think :)
> > Not 100% sure about the date since the old CVS log looks a bit fishy
> > after the repo got converted to Subversion.
>
> Ah... that was at PPCBoot times, then. Found it:
> Tue, 11 Sep 2001 15:29:26 +0200

Wow, you got your archives in order :)

>
> AFAICT the patch was late for a release, but has not been formally
> rejected. Probably just got forgotten.

Ah, I must have misunderstood then.

>
> > > Hm... will this not make escaping impossible? Assume you want to pass
> > >
> > >    arg=${name}
> > >
> > > to Linux. How would you escape this so it does NOT get expanded if
> > > you run process_macros() arbitrarily often?
> >
> > Possibly, I never needed that though.
> > One would probably need to add an escape char for that. Something
> > like arg=\${name}
>
> Woudn't this then just cause another cycle through process_macros(),
> where it then gets substitured anyway? [Guess I gotta try this out.]

I am not sure what will happen, it was so man years ago.
But I would guess that if you really want to pass arg=$(name)
to the kernel you will probably need to do some adjustment.

  Jocke