[U-Boot] [RFC PATCH 02/11] Makefile: support building SPL FIT images without device trees

[Bin Meng]

On Mon, Jul 22, 2019 at 2:00 AM Lukas Auer
<lukas.auer at aisec.fraunhofer.de> wrote:
>
> When building a U-Boot FIT image, the device trees specified by the
> board are unconditionally built for inclusion in the FIT image. However,
> not all device tree providers, such as CONFIG_OF_PRIOR_STAGE, require a
> device tree to be built and bundled with the U-Boot binary. They rely on
> other mechanisms to provide the device tree to U-Boot. Compilation on
> boards with these device tree providers fails, because they do not
> specify a device tree.
>
> Change the makefile rules to conditionally build the device trees if
> either CONFIG_OF_SEPARATE or CONFIG_OF_EMBED is selected as device tree
> provider.
>
> Signed-off-by: Lukas Auer <lukas.auer at aisec.fraunhofer.de>
> ---
>
>  Makefile | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Tested-by: Bin Meng <bmeng.cn at gmail.com>