Writing prepared FDT to persistent storage should be possible in
scripts. Create environment variables containing address and size
of the updated FDT. Scripts can use these variables after running
'spl export fdt ...' command to write the new blob to persistent
storage.

Signed-off-by: Anatolij Gustschin <agust@denx.de>

Make it clear that we need to load a legacy-formatted (aka uImage)
kernel into memory as well as the DT if used before using "spl export".

Cc: Yebio Mesfin <ymesfin@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

We add two new environment variables, falcon_args_file and
falcon_image_file, which when set will override the compiled in default
values for falcon mode.

Signed-off-by: Tom Rini <trini@ti.com>

Signed-off-by: Tom Rini <trini@ti.com>

Reviewed-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Tom Rini <trini@ti.com>

Simple howto to add support to a board
for booting the kernel from SPL ("Falcon" mode).

Signed-off-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Tom Rini <trini@ti.com>