/***********************************************************************
|
* File: start.S
|
* Version: 1.0.0
|
* Copyright: 2011 (c) Guo Wenxue <guowenxue@gmail.com>
|
* Description: This ASM used to disable watch dog and interrupt, then call C code to
|
* turn the buzzer on/off on FL2440 board.
|
* ChangeLog: 1, Release initial version on "Mon Mar 21 21:09:52 CST 2011"
|
*
|
***********************************************************************/
|
|
#define pWTCON 0x53000000 /* Watch dog register address */
|
#define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
|
#define INTSUBMSK 0x4A00001C
|
|
.text
|
.align 2
|
.global _start
|
|
_start:
|
|
/* Disable watch dog */
|
ldr r0, =pWTCON /*Save pwTCON address in r0*/
|
mov r1, #0x0 /*Set r1=0x0*/
|
str r1, [r0] /*Move the data in r1 to the address specify by r0*/
|
|
/* mask all IRQs by setting all bits in the INTMR - default */
|
mov r1, #0xffffffff
|
ldr r0, =INTMSK
|
str r1, [r0]
|
|
ldr r0, =INTSUBMSK
|
ldr r1, =0x7fff /*There are 15 bits used in INTSUBMSK on S3C2440*/
|
str r1, [r0]
|
|
bl main
|
|
halt_loop:
|
b halt_loop
|
