avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/dts/.gitignore

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+*.dtb
+*.dtb.S

u-boot/dts/Kconfig

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+#
+# Device Tree Control
+#
+
+config SUPPORT_OF_CONTROL
+	bool
+
+menu "Device Tree Control"
+	depends on SUPPORT_OF_CONTROL
+
+config OF_CONTROL
+	bool "Run-time configuration via Device Tree"
+	help
+	  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
+
+config OF_SEPARATE
+	bool "Separate DTB for DT control"
+	depends on !SANDBOX
+	help
+	  If this option is enabled, the device tree will be built and
+	  placed as a separate u-boot.dtb file alongside the U-Boot image.
+
+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. 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"
+	depends on SANDBOX
+	help
+	  If this option is enabled, DTB will be read from a file on startup.
+	  This is only useful for Sandbox.  Use the -d flag to U-Boot to
+	  specify the file to read.
+
+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.
+
+endmenu

u-boot/dts/Makefile

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+#
+# Copyright (c) 2011 The Chromium OS Authors.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
+# enabled. See doc/README.fdt-control for more details.
+
+DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
+ifeq ($(DEVICE_TREE),)
+DEVICE_TREE := unset
+endif
+
+ifneq ($(EXT_DTB),)
+DTB := $(EXT_DTB)
+else
+DTB := arch/$(ARCH)/dts/$(DEVICE_TREE).dtb
+endif
+
+$(obj)/dt.dtb: $(DTB) FORCE
+	$(call if_changed,shipped)
+
+targets += dt.dtb
+
+$(DTB): arch-dtbs
+	$(Q)test -e $@ || (						\
+	echo >&2;							\
+	echo >&2 "Device Tree Source is not correctly specified.";	\
+	echo >&2 "Please define 'CONFIG_DEFAULT_DEVICE_TREE'";		\
+	echo >&2 "or build with 'DEVICE_TREE=<device_tree>' argument";	\
+	echo >&2;							\
+	/bin/false)
+
+arch-dtbs:
+	$(Q)$(MAKE) $(build)=arch/$(ARCH)/dts dtbs
+
+.SECONDARY: $(obj)/dt.dtb.S
+
+obj-$(CONFIG_OF_EMBED) := dt.dtb.o
+
+dtbs: $(obj)/dt.dtb
+	@:
+
+clean-files := dt.dtb.S
+
+# Let clean descend into dts directories
+subdir- += ../arch/arm/dts ../arch/microblaze/dts ../arch/mips/dts ../arch/sandbox/dts ../arch/x86/dts