Update README.md

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

diff --git a/bootrom/flash-reset.s b/bootrom/flash-reset.s
index a94d048aed47ec961b48e2d6729ebee2fc11c424..95c8f590cc41af02d16e24b7be0dfed3ff093773 100644 (file)
--- a/bootrom/flash-reset.s
+++ b/bootrom/flash-reset.s
@@ -1,43 +1,51 @@
-.extern CopyBootToRAM
-    
+@-----------------------------------------------------------------------------
+@ 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"
-         .code 32
-         .align 0
+
+.arm
 
 .global flashstart
 flashstart:
-    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       .