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

[Wolfgang Denk]

Dear Tom,

In message <20131206154850.GW420 at bill-the-cat> you wrote:
> 
> 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?

Maybe I'm missing something - but what about systems with less than
1 GB RAM?  Actually only a small percentage of devices we see here
have 512 MB or more...

Best regards,

Wolfgang Denk

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