base-hw: fix bug in 'Platform_thread::pager()'
base-hw & arm_v7: fix CPU initialization bug

ref #601
hw_arndale: create builddir support

ref #601
arndale: UART driver base

ref #601
arndale: board driver base

ref #601
cortex_a15: base/mk spec

ref #601
arndale: base/mk platform spec

ref #601
hw_arndale: enable nested init test

fix #601
base-hw: rework 'run/env', enable '--target uboot'

ref #601
ref #598
base-hw: provide SIGNAL service in nested_init.run

ref #601
base: make signal framework usable for base-hw

ref #641
base-hw: destroy signal contexts, generic signal.h

fix #641
timer & hw & omap4: compile bug in Platform_timer

fix #652