flashing older nodes across t03 now works!

older nodes need the new bootloader which doesn't depend on pagesize because
those older nodes used quite large message sizes which are not supported
across t03 nodes (we would need to much RAM on t03 for this).

avr/modules/flash/io.asm

@@ -28,9 +28,11 @@ ioWaitForGivenMsg:
     ldi r20, 10                      ; number of tries
 ioWaitForGivenMsg_loop:
     push r16
-      rcall ioRawWaitForValidMsg     ; (r16, r17, r18, r19, r22, X)
-    pop r17                          ; pop into r17 (from r16)
-    brcc ioWaitForGivenMsg_end
+      push r20
+        rcall ioRawWaitForValidMsg   ; (r16, r17, r18, r19, r20, r21, r22, X)
+      pop r20
+    pop r17                          ; pop expected code to r17!
+    brcc ioWaitForGivenMsg_loopEnd
     ldi xl, LOW(flashRecvBuffer)
     ldi xh, HIGH(flashRecvBuffer)
     adiw xh:xl, COM2_MSG_OFFS_CMD
@@ -40,7 +42,8 @@ ioWaitForGivenMsg_loop:
     breq ioWaitForGivenMsg_gotIt
     cpi r16, CPRO_CMD_FLASH_END
     breq ioWaitForGivenMsg_gotIt
-    mov r16, r17                     ; put expected msg code back into r16 for next loop
+ioWaitForGivenMsg_loopEnd:
+    mov r17, r16                     ; move expected code back to r16
     dec r20
   brne ioWaitForGivenMsg_loop
   clc
@@ -52,6 +55,3 @@ ioWaitForGivenMsg_end:
 ; @end
 
 
-
-
-