- b Reset
- b UndefinedInstruction
- b SoftwareInterrupt
- b PrefetchAbort
- b DataAbort
- b Reserved
- b Irq
- b Fiq
-
-Reset:
- ldr sp, .stack_end @ initialize stack pointer to top of RAM
- bl CopyBootToRAM @ copy bootloader to RAM (in case the
- @ user re-flashes the bootloader)
- ldr r3, .bootphase2_start @ start address of RAM bootloader
- bx r3 @ jump to it
-
- .stack_end:
- .word _stack_end
- .bootphase2_start:
- .word __bootphase2_start__
-
-Fiq:
- b Fiq
-UndefinedInstruction:
- b UndefinedInstruction
-SoftwareInterrupt:
- b SoftwareInterrupt
-PrefetchAbort:
- b PrefetchAbort
-DataAbort:
- b DataAbort
-Reserved:
- b Reserved
-Irq:
- b Irq
+ 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 .