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spl: fit: Add support for applying DT overlay

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doc/uImage.FIT/overlay-fdt-boot.txt is describing how to create FIT
image with DT overlays in it.
Add support for this feature to SPL.

Here is the ZynqMP fragment where dtb points to full DT and dtbo is
overlay which should be applied on the top of dtb.
config {
        description = "ATF with full u-boot overlay";
        firmware = "atf";
        loadables = "uboot";
        fdt = "dtb", "dtbo";
};

The whole feature depends on OF_LIBFDT_OVERLAY which is adding +4kB code
and 0 for platforms which are not enabling this feature.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Michal Simek
2019-10-22 16:39:11 +02:00
committed by Tom Rini
parent 6b8b98d54d
commit 9d13b87254
2 changed files with 35 additions and 2 deletions
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9
Kconfig
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@@ -444,6 +444,15 @@ config SPL_LOAD_FIT
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
config SPL_LOAD_FIT_APPLY_OVERLAY
bool "Enable SPL applying DT overlays from FIT"
depends on SPL_LOAD_FIT
select OF_LIBFDT_OVERLAY
help
The device tree is loaded from the FIT image. Allow the SPL is to
also load device-tree overlays from the FIT image an apply them
over the device tree.
config SPL_LOAD_FIT_FULL
bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
select SPL_FIT