fdt: Add an option to disable device tree in SPL

Some boards cannot support device tree due to lack of memory. Add an option
to allow these boards to continue to work (and even use driver model).
This is a 'negative' option since most boards are expected to support device
tree in SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/dts/Kconfig b/dts/Kconfig
index 1a97e6fbdfe09c973270140f215c2aec4f341923..ddefd85893dd35d5474806ff073de00e013b11eb 100644 (file)
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -1,9 +1,6 @@
 #
 # Device Tree Control
 #
-# TODO:
-#   This feature is not currently supported for SPL,
-#    but this restriction should be removed in the future.
 
 config SUPPORT_OF_CONTROL
        bool
@@ -17,6 +14,14 @@ config OF_CONTROL
          This feature provides for run-time configuration of U-Boot
          via a flattened device tree.
 
+config SPL_DISABLE_OF_CONTROL
+       bool "Disable run-time configuration via Device Tree in SPL"
+       depends on OF_CONTROL
+       help
+         Some boards use device tree in U-Boot but only have 4KB of SRAM
+         which is not enough to support device tree. Enable this option to
+         allow such boards to be supported by U-Boot SPL.
+
 choice
        prompt "Provider of DTB for DT control"
        depends on OF_CONTROL