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/arch/sandbox/Kconfig

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+menu "Sandbox architecture"
+	depends on SANDBOX
+
+config SYS_ARCH
+	default "sandbox"
+
+config SYS_BOARD
+	default "sandbox"
+
+config SYS_CPU
+	default "sandbox"
+
+config SYS_CONFIG_NAME
+	default "sandbox"
+
+config PCI
+	bool "PCI support"
+	help
+	  Enable support for PCI (Peripheral Interconnect Bus), a type of bus
+	  used on some devices to allow the CPU to communicate with its
+	  peripherals.
+
+config DM_KEYBOARD
+	default y
+
+endmenu