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_APPLY_OVERLAY_BUF_SZ
+ depends on SPL_LOAD_FIT_APPLY_OVERLAY
+ default 0x10000
+ hex "size of temporary buffer used to load the overlays"
+ help
+ The size of the area where the overlays will be loaded and
+ uncompress. Must be at least as large as biggest overlay
+ (uncompressed)
+
config SPL_LOAD_FIT_FULL
bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
select SPL_FIT