X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=dts%2FKconfig;h=fb2d79edbc3ba375944a997bc191cad4585a2a5a;hb=d5de91086dd7bf2a1b3ecebd883636ced05d3b91;hp=ca5bd6fb46626eafb7b0f15d023d243b79783f93;hpb=fc834100950ab630f442aece500d8c9ccfa2b992;p=oweals%2Fu-boot.git

diff --git a/dts/Kconfig b/dts/Kconfig
index ca5bd6fb46..fb2d79edbc 100644
--- 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_OF_CONTROL
+	bool "Enable run-time configuration via Device Tree in SPL"
+	depends on SPL && 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
@@ -32,7 +37,9 @@ config OF_EMBED
 	bool "Embedded DTB for DT control"
 	help
 	  If this option is enabled, the device tree will be picked up and
-	  built into the U-Boot image.
+	  built into the U-Boot image. This is suitable for local debugging
+	  and development only and is not recommended for production devices.
+	  Boards in the mainline U-Boot tree should not use it.
 
 config OF_HOSTFILE
 	bool "Host filed DTB for DT control"
@@ -51,4 +58,17 @@ config DEFAULT_DEVICE_TREE
 	  It can be overridden from the command line:
 	  $ make DEVICE_TREE=<device-tree-name>
 
+config OF_SPL_REMOVE_PROPS
+	string "List of device tree properties to drop for SPL"
+	depends on SPL_OF_CONTROL
+	default "clocks clock-names interrupt-parent" if SPL_PINCTRL_FULL
+	default "pinctrl-0 pinctrl-names clocks clock-names interrupt-parent"
+	help
+	  Since SPL normally runs in a reduced memory space, the device tree
+	  is cut down to only what is needed to load and start U-Boot. Only
+	  nodes marked with the property "u-boot,dm-pre-reloc" will be
+	  included. In addition, some properties are not used by U-Boot and
+	  can be discarded. This option defines the list of properties to
+	  discard.
+
 endmenu