[U-Boot] A bl command question about smdk2410 in u-boot-2010.06

[Paul Hsu]

Hi Jianchun,

The result of objdump is based on the ELF format.
It knows that the piece of code should be put to address 0x33f80000 to run,
although the code is running at address 0x0 after power-on.

And bl instruction is a jump instruction according to an offset of PC.

That't why you see the following code
33f80060:    eb0000e6     bl    33f80400 <__coloured_LED_init>

When boot-up , this instruction is executing in NOR flash.
After sdram initialization, and code re-location, sdram contains the real code.

BR,
Paul

..........

33f80050 <start_code>:
33f80050:    e10f0000     mrs    r0, CPSR
33f80054:    e3c0001f     bic    r0, r0, #31    ; 0x1f
33f80058:    e38000d3     orr    r0, r0, #211    ; 0xd3
33f8005c:    e129f000     msr    CPSR_fc, r0
33f80060:    eb0000e6     bl    33f80400 <__coloured_LED_init>
33f80064:    eb0000e6     bl    33f80404 <__red_LED_on>
33f80068:    e3a00453     mov    r0, #1392508928    ; 0x53000000
33f8006c:    e3a01000     mov    r1, #0    ; 0x0
33f80070:    e5801000     str    r1, [r0]
33f80074:    e3e01000     mvn    r1, #0    ; 0x0
33f80078:    e59f0360     ldr    r0, [pc, #864]    ; 33f803e0 <fiq+0x60>
33f8007c:    e5801000     str    r1, [r0]
33f80080:    e59f135c     ldr    r1, [pc, #860]    ; 33f803e4 <fiq+0x64>
33f80084:    e59f035c     ldr    r0, [pc, #860]    ; 33f803e8 <fiq+0x68>
33f80088:    e5801000     str    r1, [r0]
33f8008c:    e59f0358     ldr    r0, [pc, #856]    ; 33f803ec <fiq+0x6c>
33f80090:    e3a01003     mov    r1, #3    ; 0x3
33f80094:    e5801000     str    r1, [r0]
33f80098:    eb000019     bl    33f80104 <cpu_init_crit>

33f8009c <relocate>:
33f8009c:    e24f00a4     sub    r0, pc, #164    ; 0xa4
33f800a0:    e51f1068     ldr    r1, [pc, #-104]    ; 33f80040 <_TEXT_BASE>
.............

33f80400 <__coloured_LED_init>:
33f80400:       e1a0f00e        mov     pc, lr

33f80404 <__red_LED_on>:
33f80404:       e1a0f00e        mov     pc, lr

33f80408 <__red_LED_off>:
33f80408:       e1a0f00e        mov     pc, lr

33f8040c <__green_LED_on>:
33f8040c:       e1a0f00e        mov     pc, lr

33f80410 <__green_LED_off>:
33f80410:       e1a0f00e        mov     pc, lr

33f80414 <__yellow_LED_on>:
33f80414:       e1a0f00e        mov     pc, lr

33f80418 <__yellow_LED_off>:
33f80418:       e1a0f00e        mov     pc, lr

33f8041c <__blue_LED_on>:
33f8041c:       e1a0f00e        mov     pc, lr

33f80420 <__blue_LED_off>:
33f80420:       e1a0f00e        mov     pc, lr






-- 
    Paul Hsu
    pochun.hsu at gmail.com