mkamsboot: fix for newer fuzev2

These models are restricted to OF >= v02.3.31, probably because of a
hardware change
The OF checks a version string located between 0x0 and 0x200 in the
firmware block, so let's keep this part unmodified

We put our dualboot code at 0x200, and insert a branch + vectors at 0x0
That way our patched file will present the OF version to the fuzev2 OF
patching it, and we only waste 512 bytes on other models

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27441 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 2 insertions, 13 deletions

diff --git a/rbutil/mkamsboot/dualboot/dualboot.S b/rbutil/mkamsboot/dualboot/dualboot.S
index d6a8d3701c..77fb4dec7d 100644
--- a/rbutil/mkamsboot/dualboot/dualboot.S
+++ b/rbutil/mkamsboot/dualboot/dualboot.S
@@ -51,20 +51,9 @@
 #error i2c prescaler too big!
 #endif
 
-/* Vectors */
+        b start     @ skip our data
 
-        ldr   pc, =start    /* reset vector */
-        /* next vectors are unused, halt cpu */
-1:      b 1b
-1:      b 1b
-1:      b 1b
-1:      b 1b
-1:      b 1b
-1:      b 1b
-1:      b 1b
-
-
-/* These values are filled in by mkamsboot - don't move them from offset 0x20 */
+/* These values are filled in by mkamsboot - don't move them from offset 0x4 */
 
 uclunpack_end:   .word   0 /* End of the ucl_unpack function */
 uclunpack_size:  .word   0 /* Size in bytes of the ucl_unpack function */