[U-Boot] [PATCH] jetson-tk1: Set fdtfile environment variable

[Tom Rini <trini@konsulko.com>]

On Wed, Apr 13, 2016 at 07:42:11PM +0200, Andreas F?rber wrote:
[snip]
> $fdtfile needs to be the Linux filename. It does not always follow the
> same pattern as the U-Boot variables you suggest here.
> CONFIG_DEFAULT_DEVICE_TREE ".dtb" might work better, and that was my
> question to you.
> 
> It's part of the generic mechanism, so not just select boards. Yet I was
> told that all boards are expected to set their cacheline size (although
> that is not a board but CPU property), so similarly we can (yes, newly)
> desire all boards to provide DT related settings as well.
> 
> If you would supply a feature-complete DT in the first place, we
> wouldn't need $fdtfile here, but it seemed that that was not realistic
> to expect for the upcoming U-Boot release.

So here's the thing.  Figuring out what the device tree to load is, and
where it's going to reside is a sucky problem.  For most of the complex
cases we do this today with "run findfdt".  Why?  Well, check out the
implementations in "git grep -l findfdt=" right now.  It sounds like we
need to figure out how to get EFI in line with everything else that
U-Boot does/supports rather than to re-invent the wheel here.

-- 
Tom
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