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/powerpc/cpu/mpc8260/Makefile

@@ -0,0 +1,13 @@
+#
+# (C) Copyright 2000-2008
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+extra-y	= start.o
+obj-y	= traps.o serial_smc.o serial_scc.o cpu.o cpu_init.o speed.o \
+	  interrupts.o ether_fcc.o i2c.o commproc.o \
+	  bedbug_603e.o pci.o spi.o kgdb.o
+
+obj-$(CONFIG_ETHER_ON_SCC) += ether_scc.o