X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;ds=inline;f=dts%2FKconfig;h=4b7d8b15cc04d7f3a81ab7edf50268901ee4cf8c;hb=1425a87b1478bdb2620a46f2a23af7ca2e4b6073;hp=ca5bd6fb46626eafb7b0f15d023d243b79783f93;hpb=d648964fc2495f1184af5782a0b7fc670ba5826e;p=u-boot

diff --git a/dts/Kconfig b/dts/Kconfig
index ca5bd6fb46..4b7d8b15cc 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"
@@ -46,9 +53,57 @@ endchoice
 
 config DEFAULT_DEVICE_TREE
 	string "Default Device Tree for DT control"
+	depends on OF_CONTROL
 	help
 	  This option specifies the default Device Tree used for DT control.
 	  It can be overridden from the command line:
 	  $ make DEVICE_TREE=<device-tree-name>
 
+config OF_LIST
+	string "List of device tree files to include for DT control"
+	depends on SPL_LOAD_FIT
+	default DEFAULT_DEVICE_TREE
+	help
+	  This option specifies a list of device tree files to use for DT
+	  control. These will be packaged into a FIT. At run-time, SPL will
+	  select the correct DT to use by examining the hardware (e.g.
+	  reading a board ID value). This is a list of device tree files
+	  (without the directory or .dtb suffix) separated by <space>.
+
+config OF_SPL_REMOVE_PROPS
+	string "List of device tree properties to drop for SPL"
+	depends on SPL_OF_CONTROL
+	default "interrupt-parent" if SPL_PINCTRL_FULL && SPL_CLK
+	default "clocks clock-names interrupt-parent" if SPL_PINCTRL_FULL
+	default "pinctrl-0 pinctrl-names interrupt-parent" if SPL_CLK
+	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.
+
+config SPL_OF_PLATDATA
+	bool "Generate platform data for use in SPL"
+	depends on SPL_OF_CONTROL
+	help
+	  For very constrained SPL environments the overhead of decoding
+	  device tree nodes and converting their contents into platform data
+	  is too large. This overhead includes libfdt code as well as the
+	  device tree contents itself. The latter is fairly compact, but the
+	  former can add 3KB or more to a Thumb 2 Image.
+
+	  This option enables generation of platform data from the device
+	  tree as C code. This code creates devices using U_BOOT_DEVICE()
+	  declarations. The benefit is that it allows driver code to access
+	  the platform data directly in C structures, avoidin the libfdt
+	  overhead.
+
+	  This option works by generating C structure declarations for each
+	  compatible string, then adding platform data and U_BOOT_DEVICE
+	  declarations for each node. See README.platdata for more
+	  information.
+
 endmenu