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/config.mk

@@ -0,0 +1,85 @@
+#
+# (C) Copyright 2000-2013
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+#########################################################################
+
+# This file is included from ./Makefile and spl/Makefile.
+# Clean the state to avoid the same flags added twice.
+#
+# (Tegra needs different flags for SPL.
+#  That's the reason why this file must be included from spl/Makefile too.
+#  If we did not have Tegra SoCs, build system would be much simpler...)
+PLATFORM_RELFLAGS :=
+PLATFORM_CPPFLAGS :=
+PLATFORM_LDFLAGS :=
+LDFLAGS :=
+LDFLAGS_FINAL :=
+OBJCOPYFLAGS :=
+# clear VENDOR for tcsh
+VENDOR :=
+#########################################################################
+
+ARCH := $(CONFIG_SYS_ARCH:"%"=%)
+CPU := $(CONFIG_SYS_CPU:"%"=%)
+ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_TEGRA
+CPU := arm720t
+endif
+endif
+BOARD := $(CONFIG_SYS_BOARD:"%"=%)
+ifneq ($(CONFIG_SYS_VENDOR),)
+VENDOR := $(CONFIG_SYS_VENDOR:"%"=%)
+endif
+ifneq ($(CONFIG_SYS_SOC),)
+SOC := $(CONFIG_SYS_SOC:"%"=%)
+endif
+
+# Some architecture config.mk files need to know what CPUDIR is set to,
+# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
+# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
+# CPU-specific code.
+CPUDIR=arch/$(ARCH)/cpu$(if $(CPU),/$(CPU),)
+
+sinclude $(srctree)/arch/$(ARCH)/config.mk	# include architecture dependend rules
+sinclude $(srctree)/$(CPUDIR)/config.mk		# include  CPU	specific rules
+
+ifdef	SOC
+sinclude $(srctree)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
+endif
+ifneq ($(BOARD),)
+ifdef	VENDOR
+BOARDDIR = $(VENDOR)/$(BOARD)
+else
+BOARDDIR = $(BOARD)
+endif
+endif
+ifdef	BOARD
+sinclude $(srctree)/board/$(BOARDDIR)/config.mk	# include board specific rules
+endif
+
+ifdef FTRACE
+PLATFORM_CPPFLAGS += -finstrument-functions -DFTRACE
+endif
+
+# Allow use of stdint.h if available
+ifneq ($(USE_STDINT),)
+PLATFORM_CPPFLAGS += -DCONFIG_USE_STDINT
+endif
+
+#########################################################################
+
+RELFLAGS := $(PLATFORM_RELFLAGS)
+
+PLATFORM_CPPFLAGS += $(RELFLAGS)
+PLATFORM_CPPFLAGS += -pipe
+
+LDFLAGS += $(PLATFORM_LDFLAGS)
+LDFLAGS_FINAL += -Bstatic
+
+export PLATFORM_CPPFLAGS
+export RELFLAGS
+export LDFLAGS_FINAL
+export CONFIG_STANDALONE_LOAD_ADDR