Merge branch 'master' into generalizations

Conflicts:
	lib/lm3s/vector.c -- split out to lm3s/irq.h
	lib/stm32/f4/vector.c -- put the floating point initialization code into a function like in lpc43xx

lib/lm3s/libopencm3_lm3s.ld

@@ -77,6 +77,8 @@ SECTIONS
 
 	. = ALIGN(4);
 	end = .;
+	_end = .;
+	__end = .;
 }
 
 PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram));