Only in binutils-2.20.patch51: binutils-2.20
diff -ruw ggas/config/tc-avr.c gas/config/tc-avr.c
--- ggas/config/tc-avr.c	2009-09-09 13:43:29.000000000 +0530
+++ gas/config/tc-avr.c	2010-02-12 20:42:30.742688700 +0530
@@ -133,9 +133,12 @@
   {"atmega32u2", AVR_ISA_AVR35,   bfd_mach_avr35},
   {"atmega8",    AVR_ISA_M8,      bfd_mach_avr4},
   {"atmega48",   AVR_ISA_AVR4,    bfd_mach_avr4},
+  {"atmega48a",  AVR_ISA_AVR4,    bfd_mach_avr4},
   {"atmega48p",  AVR_ISA_AVR4,    bfd_mach_avr4},
   {"atmega88",   AVR_ISA_AVR4,    bfd_mach_avr4},
+  {"atmega88a",  AVR_ISA_AVR4,    bfd_mach_avr4},
   {"atmega88p",  AVR_ISA_AVR4,    bfd_mach_avr4},
+  {"atmega88pa", AVR_ISA_AVR4,    bfd_mach_avr4},
   {"atmega8515", AVR_ISA_M8,      bfd_mach_avr4},
   {"atmega8535", AVR_ISA_M8,      bfd_mach_avr4},
   {"atmega8hva", AVR_ISA_AVR4,    bfd_mach_avr4},
@@ -150,40 +153,63 @@
   {"at90pwm3b",  AVR_ISA_AVR4,    bfd_mach_avr4},
   {"at90pwm81",  AVR_ISA_AVR4,    bfd_mach_avr4},
   {"atmega16",   AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega16a",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega161",  AVR_ISA_M161,    bfd_mach_avr5},
   {"atmega162",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega163",  AVR_ISA_M161,    bfd_mach_avr5},
+  {"atmega164a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega164p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega165",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega165p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega168",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega168a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega168p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega169",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega169a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega169p", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega169pa",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega16hva",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega16hvb",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega16c1", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega32",   AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega323",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega324a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega324p", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega324pa",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega325",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega325p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega3250", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega3250p",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega328",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega328p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega329",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega329p", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega329pa",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega3290", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega3290p",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega32hvb",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega406",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega64",   AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega640",  AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega644",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega644a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega644p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega644pa",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega645",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega645a", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega645p", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega649",  AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega649p", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega649a", AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega6450", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega6450a",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega6450p",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega6490", AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega6490a",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega6490p",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega64hve",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega16hva",AVR_ISA_AVR5,    bfd_mach_avr5},
+  {"atmega16hva2",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega16hvb",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"atmega32hvb",AVR_ISA_AVR5,    bfd_mach_avr5},
   {"at90can32" , AVR_ISA_AVR5,    bfd_mach_avr5},
diff -ruw ggas/doc/c-avr.texi gas/doc/c-avr.texi
--- ggas/doc/c-avr.texi	2009-09-02 12:54:21.000000000 +0530
+++ gas/doc/c-avr.texi	2010-02-12 21:31:02.132717100 +0530
@@ -43,9 +43,10 @@
 
 Instruction set avr25 is for the classic AVR core with up to 8K program memory
 space plus the MOVW instruction (MCU types: attiny13, attiny13a, attiny2313,
-attiny2313a, attiny24, attiny24a, attiny4313, attiny44, attiny44a, attiny84,
-attiny25, attiny45, attiny85, attiny261, attiny261a, attiny461, attiny861,
-attiny861a, attiny87, attiny43u, attiny48, attiny88, at86rf401, ata6289).
+attiny2313a, attiny24, attiny24a, attiny4313, attiny43u, attiny44, attiny44a, 
+attiny84, attiny25, attiny45, attiny85, attiny261, attiny261a, attiny461, 
+attiny461a, attiny861, attiny861a, attiny87, attiny43u, attiny48, attiny88, 
+at86rf401, ata6289).
 
 Instruction set avr3 is for the classic AVR core with up to 128K program
 memory space (MCU types: at43usb355, at76c711).
@@ -58,20 +59,25 @@
 atmega16u2, atmega32u2).
 
 Instruction set avr4 is for the enhanced AVR core with up to 8K program
-memory space (MCU types: atmega48, atmega48p,atmega8, atmega88, atmega88p,
-atmega8515, atmega8535, atmega8hva, atmega4hvd, atmega8hvd, at90pwm1,
-at90pwm2, at90pwm2b, at90pwm3, at90pwm3b, at90pwm81, atmega8m1, atmega8c1).
+memory space (MCU types: atmega48, atmega48a, atmega48p,atmega8, atmega88, 
+atmega88a, atmega88p, atmega88pa, atmega8515, atmega8535, atmega8hva, 
+atmega4hvd, atmega8hvd, at90pwm1,at90pwm2, at90pwm2b, at90pwm3, at90pwm3b,
+at90pwm81, atmega8m1, atmega8c1).
 
 Instruction set avr5 is for the enhanced AVR core with up to 128K program
-memory space (MCU types: atmega16, atmega161, atmega162, atmega163, atmega164p,
-atmega165, atmega165p, atmega168, atmega168p, atmega169, atmega169p, atmega16c1,
-atmega32, atmega323, atmega324p, atmega325, atmega325p, atmega3250, atmega3250p,
-atmega328p, atmega329, atmega329p, atmega3290, atmega3290p, atmega406, atmega64,
-atmega640, atmega644, atmega644p, atmega644pa, atmega645, atmega6450, atmega649,
-atmega6490, atmega16hva, atmega16hvb, atmega32hvb, at90can32, at90can64,
-at90pwm216, at90pwm316, atmega32c1, atmega64c1, atmega16m1, atmega32m1,
-atmega64m1, atmega16u4, atmega32u4, atmega32u6, at90usb646, at90usb647, at94k,
-at90scr100).
+memory space (MCU types: atmega16, atmega16a, atmega161, atmega162, atmega163,
+atmega164a, atmega164p, atmega165, atmega165a, atmega165p, atmega168, 
+atmega168a, atmega168p, atmega169, atmega169p, atmega169pa, atmega16c1,
+atmega32, atmega323, atmega324a, atmega324p, atmega324pa, atmega325, 
+atmega325p, atmega3250, atmega3250p, atmega328, atmega328p, atmega329,
+atmega329p, atmega329pa, atmega3290, atmega3290p, atmega406, atmega64,
+atmega640, atmega644, atmega644a, atmega644p, atmega644pa, atmega645, 
+atmega645a, atmega645p, atmega6450, atmega6450a, atmega6450p, atmega649,
+atmega649a, atmega649p, atmega6490, atmega6490a, atmega6490p, atmega64hve,
+atmega16hva, atmega16hva2, atmega16hvb, atmega32hvb, at90can32, at90can64,
+at90pwm216, at90pwm316, atmega16u4, atmega32c1, atmega64c1, atmega64m1,
+atmega16m1, atmega32m1, atmega64m1, atmega16u4, atmega32u4, atmega32u6,
+at90usb646, at90usb647, at94k, at90scr100).
 
 Instruction set avr51 is for the enhanced AVR core with exactly 128K program
 memory space (MCU types: atmega128, atmega1280, atmega1281, atmega1284p,
