crtboothi.s

avr的icc编译器的源代码

; make sure to assemble w/ -n flag, e.g.
; iasavr -n crt...

; bootloader startup file. Basically, the same as the crtboot.s except that
; elpm is used and RAMPZ is set to 1. This is for device where the bootloader
; resides at > 64K byte address

	.include "area.s"

	.text
__start::			; entry point
	; route vector
	ldi R16,1
	out 0x35,R16	; MCUCR = 1, unlock IVSEL
	ldi R16,2
	out 0x35,R16	; MCUCR = 2, set uvsel

	USE_ELPM = 1
	.include init.s
; call user main routine
	rcall _main
_exit::
	rjmp	_exit

	.area vector(abs)
	.org 0		; will be relocated by -bvector switch
	jmp __start