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/doc/README.commands.itest

@@ -0,0 +1,16 @@
+A slow day today so here is a revised itest command with provisional
+support for comparing strings as well :-))
+
+Now table driven to allow the operators
+-eq, -ne, -lt, -gt, -le, -ge, ==, !=, <>, <, >, <=, >=
+
+Uses the expected command modifier for integer compares of width 1, 2 or
+4 bytes of .b, .w, .l and the new modifer of .s for a string compare.
+String comparison is over the length of the shorter, this hopefully
+avoids missing terminators when using an indirect pointer.
+
+eg.
+if itest.l *40000 == 12345678 then; ....
+if itest.w *40000 != 1234 then; ....
+if itest.b *40000 >= 12 then; ....
+if itest.s *40000 -eq hello then; ....