[U-Boot] [RFC] ARM: Start using fdt_high for relocation

[Tom Rini]

Hey all,

I've been thinking.  We've had a thread on i.MX platforms about fdt
being overwritten and needing to be moved to another address.  And I've
also had an internal problem about fdt being overwritten.  So, how about
as a rule of thumb we start setting fdt_high (in configs) to
memory-start + 512MiB, as that's the lowmem limit we should always have
available.  This will fix the problem of BSS overwriting the DT, which
is the problem we won't catch in normal bootm/bootz usage.  Thoughts?

-- 
Tom
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