diff -Naurp gcc/config/avr/avr-mcus.def gcc/config/avr/avr-mcus.def
--- gcc/config/avr/avr-mcus.def	2013-02-07 12:08:53.000000000 +0530
+++ gcc/config/avr/avr-mcus.def	2013-02-07 12:16:18.000000000 +0530
@@ -199,6 +199,7 @@ AVR_MCU ("atmega64hve",          ARCH_AV
 AVR_MCU ("atmega64hve2",	  ARCH_AVR5, "__AVR_ATmega64HVE2__",	  0, 0, 0x0100, 1, "m64hve2")
 AVR_MCU ("atmega64rfa2",         ARCH_AVR5, "__AVR_ATmega64RFA2__",      0, 0, 0x0200, 1, "m64rfa2")
 AVR_MCU ("atmega64rfr2",         ARCH_AVR5, "__AVR_ATmega64RFR2__",      0, 0, 0x0200, 1, "m64rfr2")
+AVR_MCU ("atmega644rfr2",        ARCH_AVR5, "__AVR_ATmega644RFR2__",     0, 0, 0x0200, 1, "m644rfr2")
 AVR_MCU ("at90can32",            ARCH_AVR5, "__AVR_AT90CAN32__",         0, 0, 0x0100, 1, "can32")
 AVR_MCU ("at90can64",            ARCH_AVR5, "__AVR_AT90CAN64__",         0, 0, 0x0100, 1, "can64")
 AVR_MCU ("at90pwm161",           ARCH_AVR5, "__AVR_AT90PWM161__",        0, 0, 0x0100, 1, "90pwm161")
@@ -229,6 +230,7 @@ AVR_MCU ("atmega1284p",          ARCH_AV
 AVR_MCU ("atmega128rfa1",        ARCH_AVR51, "__AVR_ATmega128RFA1__",    0, 0, 0x0200, 2, "m128rfa1")
 AVR_MCU ("atmega128rfa2",        ARCH_AVR51, "__AVR_ATmega128RFA2__",    0, 0, 0x0200, 2, "m128rfa2")
 AVR_MCU ("atmega128rfr2",        ARCH_AVR51, "__AVR_ATmega128RFR2__",    0, 0, 0x0200, 2, "m128rfr2")
+AVR_MCU ("atmega1284rfr2",       ARCH_AVR51, "__AVR_ATmega1284RFR2__",   0, 0, 0x0200, 2, "m1284rfr2")
 AVR_MCU ("at90can128",           ARCH_AVR51, "__AVR_AT90CAN128__",       0, 0, 0x0100, 2, "can128")
 AVR_MCU ("at90usb1286",          ARCH_AVR51, "__AVR_AT90USB1286__",      0, 0, 0x0100, 2, "usb1286")
 AVR_MCU ("at90usb1287",          ARCH_AVR51, "__AVR_AT90USB1287__",      0, 0, 0x0100, 2, "usb1287")
@@ -238,6 +240,7 @@ AVR_MCU ("atmega2560",           ARCH_AV
 AVR_MCU ("atmega2561",           ARCH_AVR6, "__AVR_ATmega2561__",        0, 0, 0x0200, 4, "m2561")
 AVR_MCU ("atmega256rfa2",        ARCH_AVR6, "__AVR_ATmega256RFA2__",     0, 0, 0x0200, 4, "m256rfa2")
 AVR_MCU ("atmega256rfr2",        ARCH_AVR6, "__AVR_ATmega256RFR2__",     0, 0, 0x0200, 4, "m256rfr2")
+AVR_MCU ("atmega2564rfr2",       ARCH_AVR6, "__AVR_ATmega2564RFR2__",    0, 0, 0x0200, 4, "m2564rfr2")
 /* Enhanced, == 20K starts at 0x8000 */
 AVR_MCU ("avr7",                 ARCH_AVR7, NULL,                        0, 0, 0x0200, 1, "a5831")
 AVR_MCU ("ata5831",              ARCH_AVR7, "__AVR_ATA5831__",           0, 0, 0x0200, 1, "a5831")