+ # Note - we cannot just invoke:
+ #
+ # write 1, _passmsg, 5
+ #
+ # here because _passmsg contains the run-time (VMA) address of
+ # the pass string (probably 0x500) not the load-time (LMA)
+ # address (probably 0x804c). Normally using the VMA address
+ # would be the correct thing to do - *if* there was some start
+ # up code which copied data from LMA to VMA. But we have no
+ # start up code, so the data still resides at the LMA
+ # address. Hence we use __romdatastart instead.
+ #
+ # Note - we are cheating because the address that we pass to
+ # "write" should actually be:
+ #
+ # __romdatastart + (_passmsg - __datastart)
+ #
+ # but the assembler cannot cope with this expression. So we
+ # cheat and use the fact that we know that _passmsg is the
+ # first string in the .data section and so (_passmsg -
+ # __datastart) evaluates to zero.
+
+ write 1, __romdatastart, 5