[U-Boot] [uboot PATCH v2] Add uboot "fdt_high" enviroment variable

[David Long]

On Fri, 2011-07-15 at 03:50 +0900, Grant Likely wrote:


> Regardless of this patch, the pandaboard uboot still needs to be
> fixed. Setting an fdt_high variable is useful for debug, but it is not
> a fix.
> 


Then someone needs to own the issue of stopping  the current u-boot
default behavior of relocating the initrd and fdt to the end of RAM when
an fdt is present.  This is an issue for any Linux ARM system with more
than 3/4GB of RAM, and probably for other 32-bit architectures.   The
logic that causes the problem is in architecture-independent code, and
I'm not sure I'm necessarily the right guy to go rummaging around in
there.  There are too many implications for any other currently
supported targets that use u-boot and fdt.

This new u-boot environment variable stands on it's own as potentially
useful, and allows us to avoid the problem (admittedly by specifying
environment variable values that really should be the default in this
case). 

-dl