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/arm/mach-tegra/tegra124/Kconfig

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+if TEGRA124
+
+choice
+	prompt "Tegra124 board select"
+	optional
+
+config TARGET_JETSON_TK1
+	bool "NVIDIA Tegra124 Jetson TK1 board"
+	select CPU_V7_HAS_NONSEC if !SPL_BUILD
+	select CPU_V7_HAS_VIRT if !SPL_BUILD
+
+config TARGET_NYAN_BIG
+	bool "Google/NVIDIA Nyan-big Chromebook"
+	help
+	  Nyan Big is a Tegra124 clamshell board that is very similar
+	  to venice2, but it has a different panel, the sdcard CD and WP
+	  sense are flipped, and it has a different revision of the AS3722
+	  PMIC. The retail name is the Acer Chromebook 13 CB5-311-T7NN
+	  (13.3-inch HD, NVIDIA Tegra K1, 2GB).
+
+config TARGET_VENICE2
+	bool "NVIDIA Tegra124 Venice2"
+
+config TARGET_KEIN_BASEBOARD
+	bool "Avionic Design Kein Baseboard"
+	select CPU_V7_HAS_NONSEC if !SPL_BUILD
+	select CPU_V7_HAS_VIRT if !SPL_BUILD
+	help
+	  Minimal baseboard for Avionic Design Meerkat COM. Should work with most
+	  baseboard that follow the reference design.
+
+endchoice
+
+config SYS_SOC
+	default "tegra124"
+
+source "board/nvidia/jetson-tk1/Kconfig"
+source "board/nvidia/nyan-big/Kconfig"
+source "board/nvidia/venice2/Kconfig"
+source "board/avionic-design/kein-baseboard/Kconfig"
+
+endif