[U-Boot-Users] builtin OF tree dtb gone

Wolfgang Denk wd at denx.de
Sun Dec 17 18:10:43 CET 2006

In message <008901c721e6$ece8c160$1e67a8c0 at Jocke> you wrote:
> > 
> > Then store the DTB in flash, probably as part of  your  production  /
> > update mechanism. Nobody prevents you from doing this.
> Well, newer versions of U-boot prevents me from embedding the OF tree
> inside the u-boot image.

I wrote "in flash" - this does not mean that it has  to  be  embedded
within  the  U-Boot  image.  It  can  be simply attached to it's end,
probably with some padding to allow for sector alignment.

> "in some setups", that's the point. Our setup works fine with
> an embedded OF tree in u-boot. If I am to adapt to this new
> method of supplying the OF tree, not only will I have to repartion
> the flash to fit the tree in there, I also need to make sure

It should make very little difference (probably not  visible  to  the
rest  of the system), if the tree is embedded within the U-Boot image
or attached to it's end (or if it's preceeding the image).

> that some 15-20 people learns this new concept for no real gain.

You complain abouyt a problem where there is none.

> It is nothing wrong with having the ability provide a OF tree
> at boot time, but forcing everyone to do so is. The
> most flexible way is to have both.

You are not forced into anything here.

If you like, you can  still  use  your  own  boared-specific  lkinker
script  and  "embed"  he tree to any location in your image; you just
have to find a good way to remember the start address. Actually  that
should  not  be  too  difficult,  either.  It  should be prossible to
automatically set an environment variable to the right address.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Everyting looks interesting until you do it. Then you find it's  just
another job.                     - Terry Pratchett, _Moving Pictures_

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