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Some users may wish to pass the cboot-supplied DTB to the booted kernel rather than having U-Boot load the DTB itself. To allow this, expose the address of the cboot-supplied DTB in environment variable $fdt_addr. At least when using extlinux.conf, if the user doesn't explicitly specify which DTB to pass to the kernel, U-Boot passes the DTB referred to by this variable. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>