hf topaz reader implementation:

[proxmark3-svn] / bootrom / flash-reset.s

@-----------------------------------------------------------------------------
@ This code is licensed to you under the terms of the GNU GPL, version 2 or,
@ at your option, any later version. See the LICENSE.txt file for the text of
@ the license.
@-----------------------------------------------------------------------------
@ Reset vector for running from FLASH
@-----------------------------------------------------------------------------

.section .startup,"ax"

.arm

.global flashstart
flashstart:
	b	reset
	b	undefined_instruction
	b	software_interrupt
	b	prefetch_abort
	b	data_abort
	b	. @reserved
	ldr	pc, [pc,#-0xF20]	@ IRQ - read the AIC
	b	fiq

reset:
	ldr	sp, =_stack_end		@ initialize stack pointer to top of RAM

	@ copy bootloader to RAM (in case the user re-flashes the bootloader)
	ldr	r0, =__bootphase2_src_start__
	ldr	r1, =__bootphase2_start__
	ldr	r2, =__bootphase2_end__
1:
	ldr	r3, [r0], #4
	str	r3, [r1], #4
	cmp	r1, r2
	blo	1b

	ldr	r3, =ram_start		@ start address of RAM bootloader
	bx	r3			@ jump to it

	.ltorg

undefined_instruction:
	b	.
software_interrupt:
	b	.
prefetch_abort:
	b	.
data_abort:
	b	.
fiq:
	b	.