diff --git a/ChangeLog b/ChangeLog
index 5ce7ac97..15f5c8ac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-05-15 Colin O'Flynn <coflynn@newae.com>
+
+	* avrdude.conf.in: Rename the ATmega164 and ATmega324 into
+	ATmega164P and ATmega324P, resp.  Add an entry for the ATmega644P.
+	Fixes bug #19769: ATmega164p not recognized
+
 2007-05-15 Joerg Wunsch <j@uriah.heep.sax.de>
 
 	* ser_posix.c (ser_send): Don't select() on the output fd before
diff --git a/avrdude.conf.in b/avrdude.conf.in
index 837f2747..c1eb963f 100644
--- a/avrdude.conf.in
+++ b/avrdude.conf.in
@@ -3134,14 +3134,14 @@ part
 
 
 #------------------------------------------------------------
-# ATmega164
+# ATmega164P
 #------------------------------------------------------------
 
 # close to ATmega16
 
 part
-    id               = "m164";
-    desc             = "ATMEGA164";
+    id               = "m164p";
+    desc             = "ATMEGA164P";
     has_jtag         = yes;
 #   stk500_devcode   = 0x82; # no STK500v1 support
 #   avr910_devcode   = 0x?;  # try the ATmega16 one:^
@@ -3326,14 +3326,14 @@ part
 
 
 #------------------------------------------------------------
-# ATmega324
+# ATmega324P
 #------------------------------------------------------------
 
-# similar to ATmega164
+# similar to ATmega164P
 
 part
-    id               = "m324";
-    desc             = "ATMEGA324";
+    id               = "m324p";
+    desc             = "ATMEGA324P";
     has_jtag         = yes;
 #   stk500_devcode   = 0x82; # no STK500v1 support
 #   avr910_devcode   = 0x?;  # try the ATmega16 one:^
@@ -3708,6 +3708,198 @@ part
         ;
   ;
 
+#------------------------------------------------------------
+# ATmega644P
+#------------------------------------------------------------
+
+# similar to ATmega164p
+
+part
+    id               = "m644p";
+    desc             = "ATMEGA644P";
+    has_jtag         = yes;
+#   stk500_devcode   = 0x82; # no STK500v1 support
+#   avr910_devcode   = 0x?;  # try the ATmega16 one:^
+    avr910_devcode   = 0x74;
+    signature        = 0x1e 0x96 0x0a;
+    pagel            = 0xd7;
+    bs2              = 0xa0;
+    chip_erase_delay = 9000;
+    pgm_enable       = "1 0 1 0  1 1 0 0    0 1 0 1  0 0 1 1",
+                       "x x x x  x x x x    x x x x  x x x x";
+
+    chip_erase       = "1 0 1 0  1 1 0 0    1 0 0 x  x x x x",
+                       "x x x x  x x x x    x x x x  x x x x";
+
+    timeout		= 200;
+    stabdelay		= 100;
+    cmdexedelay		= 25;
+    synchloops		= 32;
+    bytedelay		= 0;
+    pollindex		= 3;
+    pollvalue		= 0x53;
+    predelay		= 1;
+    postdelay		= 1;
+    pollmethod		= 0;
+
+    pp_controlstack     =
+        0x0E, 0x1E, 0x0F, 0x1F, 0x2E, 0x3E, 0x2F, 0x3F,
+        0x4E, 0x5E, 0x4F, 0x5F, 0x6E, 0x7E, 0x6F, 0x7F,
+        0x66, 0x76, 0x67, 0x77, 0x6A, 0x7A, 0x6B, 0x7B,
+        0xBE, 0xFD, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02;
+    hventerstabdelay    = 100;
+    progmodedelay       = 0;
+    latchcycles         = 6;
+    togglevtg           = 0;
+    poweroffdelay       = 0;
+    resetdelayms        = 0;
+    resetdelayus        = 0;
+    hvleavestabdelay    = 15;
+    chiperasepulsewidth = 0;
+    chiperasepolltimeout = 10;
+    programfusepulsewidth = 0;
+    programfusepolltimeout = 5;
+    programlockpulsewidth = 0;
+    programlockpolltimeout = 5;
+
+    idr                 = 0x31;
+    spmcr               = 0x57;
+    allowfullpagebitstream = no;
+
+    memory "eeprom"
+        paged           = no; /* leave this "no" */
+        page_size       = 8;  /* for parallel programming */
+        size            = 2048;
+        min_write_delay = 9000;
+        max_write_delay = 9000;
+        readback_p1     = 0xff;
+        readback_p2     = 0xff;
+	read            = "  1   0   1   0      0   0   0   0",
+                          "  0   0   x   x    a11 a10  a9  a8",
+                          " a7  a6  a5  a4     a3  a2  a1  a0",
+                          "  o   o   o   o      o   o   o   o";
+
+	write           = "  1   1   0   0      0   0   0   0",
+                          "  0   0   x   x    a11 a10  a9  a8",
+                          " a7  a6  a5  a4     a3  a2  a1  a0", 
+                          "  i   i   i   i      i   i   i   i";
+
+	loadpage_lo	= "  1   1   0   0      0   0   0   1",
+			  "  0   0   0   0      0   0   0   0",
+			  "  0   0   0   0      0  a2  a1  a0",
+			  "  i   i   i   i      i   i   i   i";
+
+	writepage	= "  1   1   0   0      0   0   1   0",
+			  "  0   0   x   x    a11 a10  a9  a8",
+			  " a7  a6  a5  a4     a3   0   0   0",
+			  "  x   x   x   x      x   x   x   x";
+
+	mode		= 0x41;
+	delay		= 10;
+	blocksize	= 128;
+	readsize	= 256;
+      ;
+
+    memory "flash"
+        paged           = yes;
+        size            = 65536;
+        page_size       = 256;
+        num_pages       = 256;
+        min_write_delay = 4500;
+        max_write_delay = 4500;
+        readback_p1     = 0xff;
+        readback_p2     = 0xff;
+        read_lo         = "  0   0   1   0      0   0   0   0",
+                          "a15 a14 a13 a12    a11 a10  a9  a8",
+                          " a7  a6  a5  a4     a3  a2  a1  a0",
+                          "  o   o   o   o      o   o   o   o";
+
+        read_hi         = "  0   0   1   0      1   0   0   0",
+                          "a15 a14 a13 a12    a11 a10  a9  a8",
+                          " a7  a6  a5  a4     a3  a2  a1  a0",
+                          "  o   o   o   o      o   o   o   o";
+
+        loadpage_lo     = "  0   1   0   0      0   0   0   0",
+                          "  0   0   x   x      x   x   x   x",
+                          "  x  a6  a5  a4     a3  a2  a1  a0",
+                          "  i   i   i   i      i   i   i   i";
+
+        loadpage_hi     = "  0   1   0   0      1   0   0   0",
+                          "  0   0   x   x      x   x   x   x",
+                          "  x  a6  a5  a4     a3  a2  a1  a0",
+                          "  i   i   i   i      i   i   i   i";
+
+        writepage       = "  0   1   0   0      1   1   0   0",
+                          "a15 a14 a13 a12    a11 a10  a9  a8",
+                          " a7   x   x   x      x   x   x   x",
+                          "  x   x   x   x      x   x   x   x";
+
+	mode		= 0x21;
+	delay		= 6;
+	blocksize	= 256;
+	readsize	= 256;
+      ;
+
+    memory "lock"
+        size            = 1;
+        read            = "0 1 0 1  1 0 0 0   0 0 0 0  0 0 0 0",
+                          "x x x x  x x x x   x x o o  o o o o";
+
+        write           = "1 0 1 0  1 1 0 0   1 1 1 x  x x x x",
+                          "x x x x  x x x x   1 1 i i  i i i i";
+        min_write_delay = 9000;
+        max_write_delay = 9000;
+      ;
+
+    memory "lfuse"
+        size            = 1;
+        read            = "0 1 0 1  0 0 0 0   0 0 0 0  0 0 0 0",
+                          "x x x x  x x x x   o o o o  o o o o";
+
+        write           = "1 0 1 0  1 1 0 0   1 0 1 0  0 0 0 0",
+                          "x x x x  x x x x   i i i i  i i i i";
+        min_write_delay = 9000;
+        max_write_delay = 9000;
+      ;
+
+    memory "hfuse"
+        size            = 1;
+        read            = "0 1 0 1  1 0 0 0   0 0 0 0  1 0 0 0",
+                          "x x x x  x x x x   o o o o  o o o o";
+
+        write           = "1 0 1 0  1 1 0 0   1 0 1 0  1 0 0 0",
+                          "x x x x  x x x x   i i i i  i i i i";
+        min_write_delay = 9000;
+        max_write_delay = 9000;
+      ;
+
+    memory "efuse"
+        size            = 1;
+
+        read            = "0 1 0 1  0 0 0 0  0 0 0 0  1 0 0 0",
+                          "x x x x  x x x x  o o o o  o o o o";
+
+        write           = "1 0 1 0  1 1 0 0  1 0 1 0  0 1 0 0",
+                          "x x x x  x x x x  1 1 1 1  1 i i i";
+        min_write_delay = 9000;
+        max_write_delay = 9000;
+      ;
+
+    memory "signature"
+        size            = 3;
+        read            = "0  0  1  1   0  0  0  0   x  x  x  x   x  x  x  x",
+                          "x  x  x  x   x  x a1 a0   o  o  o  o   o  o  o  o";
+      ;
+
+    memory "calibration"
+        size            = 1;
+
+        read            = "0 0 1 1  1 0 0 0   0 0 0 x  x x x x",
+                          "0 0 0 0  0 0 0 0   o o o o  o o o o";
+        ;
+  ;
+
+
 
 #------------------------------------------------------------
 # ATmega162