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Code

add some initial cpu code in led.S

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This commit is contained in:
xiangfu 2008-06-13 16:17:04 -04:00
parent 98fb0b6654
commit 280f8ffb13
1 changed files with 60 additions and 2 deletions
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60
qiboot/src/led.S
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@ -2,16 +2,74 @@
_start: b start_code _start: b start_code
start_code: start_code:
ldr sp,=1024*4
/*
* set the cpu to SVC32 mode
*/
mrs r0,cpsr
bic r0,r0,#0x1f
orr r0,r0,#0xd3
msr cpsr,r0
/* turn off the watchdog */ /* turn off the watchdog */
# define pWTCON 0x53000000 # define pWTCON 0x53000000
# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
# define INTSUBMSK 0x4A00001C
# define INTSUBMSK_val 0xffff
# define CAMDIVN 0x4C000018
ldr r0, =pWTCON ldr r0, =pWTCON
mov r1, #0x0 mov r1, #0x0
str r1, [r0] str r1, [r0]
/*
* mask all IRQs by setting all bits in the INTMR - default
*/
mov r1, #0xffffffff
ldr r0, =INTMSK
str r1, [r0]
ldr r1, =INTSUBMSK_val
ldr r0, =INTSUBMSK
str r1, [r0]
/* Make sure we get FCLK:HCLK:PCLK = 1:3:6 */
ldr r0, =CAMDIVN
mov r1, #0
str r1, [r0]
/* Clock asynchronous mode */
mrc p15, 0, r1, c1, c0, 0
orr r1, r1, #0xc0000000
mcr p15, 0, r1, c1, c0, 0
/* enable uart */
ldr r0, =0x4c00000c /* clkcon */
ldr r1, =0x7fff0 /* all clocks on */
str r1, [r0]
/* gpio UART0 init */
ldr r0, =0x56000070
mov r1, #0xaa
str r1, [r0]
/* init uart */
ldr r0, =0x50000000
mov r1, #0x03
str r1, [r0]
ldr r1, =0x245
str r1, [r0, #0x04]
mov r1, #0x01
str r1, [r0, #0x08]
mov r1, #0x00
str r1, [r0, #0x0c]
mov r1, #0x1a
str r1, [r0, #0x28]
/* blink led */
ldr sp,=1024*4
.extern blink_led .extern blink_led
bl blink_led bl blink_led
.global delay .global delay
delay: delay:
subs r0,r0,#0x1 subs r0,r0,#0x1