First implementation of ATxmega support. By now, only the

PDI mode of the STK600 is supported.  Single-byte EEPROM
(and flash) updates do not work yet.
* avr.c: "boot" memory is a candidate memory region for paged
operations, besides "flash" and "eeprom".
* avrdude.conf.in: add ATxmega128A1 and ATxmega128A1revD
* avrpart.h: add the AVRPART_HAS_PDI flag (used to distinguish
ATxmega parts from classic AVRs), the nvm_base part field, and
the offset field for a memory region.
* config_gram.y: add "has_pdi", "nvm_base", and "offset"
* lexer.l: (Ditto.)
* main.c: disable auto_erase for ATxmega parts
* stk500v2.c: implement the XPROG functionality, and divert to
this for ATxmega parts
* avrdude.1: Document the changes.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@777 81a1dc3b-b13d-400b-aceb-764788c761c2

main.c

@@ -953,7 +953,14 @@ int main(int argc, char * argv [])
   }
 
 
-
+  if ((p->flags & AVRPART_HAS_PDI) != 0) {
+    /*
+     * This is an ATxmega which can page erase, so no auto erase is
+     * needed.
+     */
+    auto_erase = 0;
+  }
+  
 
   if ((erase == 0) && (auto_erase == 1)) {
     AVRMEM * m;