Add the "stk500generic" programmer that auto-probes for STK500

either firmware version 1 or 2.
* Makefile.am (avrdude_SOURCES): add the new files
stk500generic.c and stk500generic.h.
* avrdude.conf.in: Add the stk500generic programmer type, and
change the "stk500" entry to point to this programmer.
* config_gram.y: Add the stk500generic keyword.
* lexer.l: (Ditto.)
* stk500.c: Change the stk500v1 code to not call exit()
prematurely when failing to open the programmer, but instead
return an error status.
* stk500generic.c: (New file.) Stub programmer implementation.
Probe for either stk500v1 or stk500v2, and adjust the current pgm
appropriately.
* stk500generic.h: (New file.) Declare the public interface(s)
of stk500generic.c.
* doc/avrdude.texi: Document the changed behaviour of stk500.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@663 81a1dc3b-b13d-400b-aceb-764788c761c2

avrdude.conf.in

@@ -15,7 +15,7 @@
 #   programmer
 #       id       = <id1> [, <id2> [, <id3>] ...] ;  # <idN> are quoted strings
 #       desc     = <description> ;                  # quoted string
-#       type     = par | stk500 | stk500v2 | stk500pp | stk500hvsp |
+#       type     = par | stk500 | stk500v2 | stk500pp | stk500hvsp | stk500generic |
 #                  avr910 | butterfly | usbasp |
 #                  jtagmki | jtagmkii | jtagmkii_isp; # programmer type
 #       baudrate = <num> ;                          # baudrate for avr910-programmer
@@ -316,12 +316,13 @@ programmer
 ;
 
 # This is supposed to be the "default" STK500 entry.
-# Refers to V1 by now, might be changed to V2 in a
-# future release.
+# Attempts to select the correct firmware version
+# by probing for it.  Better use one of the entries
+# below instead.
 programmer
   id    = "stk500";
   desc  = "Atmel STK500";
-  type  = stk500;
+  type  = stk500generic;
 ;
 
 programmer