system clock
gpio_init/0, toggle_led/1 - bitmask
lm4f120h5qr.h from stellarisware
preliminary (nonfuctioning) newlib stubs
better naming for c_entry.c -> system.c
systick works on lm4f, light cleanup
mockable sysputc + nonobvious mixup of init code
jump back to original mode when we run first time; s/lala/context_sw/
better stack setup after reset, some minor hacks on fault hnds
no opts, link libgcc as last item
easier placement of program sections
gdbinit for external dbg
README