From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Wood <oss@buserror.net>
Date: Mon, 29 Feb 2016 18:00:27 -0600
Subject: [U-Boot] [PATCH 2/2] boards: ls2080: Disable fdt copying by
 default
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 <1456790301-28685-2-git-send-email-york.sun@nxp.com>
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On Mon, 2016-02-29 at 15:58 -0800, York Sun wrote:
> If set, fdt_high restricts the address used by copying device tree.
> It doesn't help much to set a default address without knowing how
> much memory is available, or how memory is used. Setting fdt_high
> to a specical value (0xffffffffffffffff) disables this copying.
> 
> Signed-off-by: York Sun <york.sun@nxp.com>

Is there a limit that Linux needs the fdt to be under?

I'd hope fdt_high wouldn't cause the device tree to be relocated beyond the
end of memory, or in reserved memory...

-Scott