diff -Naurp gcc/config/avr/avr-devices.c gcc/config/avr/avr-devices.c
--- gcc/config/avr/avr-devices.c	2011-11-16 18:28:11.000000000 +0530
+++ gcc/config/avr/avr-devices.c	2011-11-16 18:33:39.000000000 +0530
@@ -222,6 +222,7 @@ const struct mcu_type_s avr_mcu_types[] 
   { "atmega32hvb",          ARCH_AVR5, "__AVR_ATmega32HVB__",       0, 0x0100, "m32hvb" },
   { "atmega32hvbrevb",      ARCH_AVR5, "__AVR_ATmega32HVBREVB__",   1, 0x0100, "m32hvbrevb" },
   { "atmega16hva2",         ARCH_AVR5, "__AVR_ATmega16HVA2__",      0, 0x0100, "m16hva2" },
+  { "atmega48hvf",          ARCH_AVR5, "__AVR_ATmega48HVF__",       0, 0x0100, "m48hvf" },
   { "at90can32",            ARCH_AVR5, "__AVR_AT90CAN32__",         0, 0x0100, "can32" },
   { "at90can64",            ARCH_AVR5, "__AVR_AT90CAN64__",         0, 0x0100, "can64" },
   { "at90pwm216",           ARCH_AVR5, "__AVR_AT90PWM216__",        0, 0x0100, "90pwm216" },
diff -Naurp gcc/config/avr/t-avr gcc/config/avr/t-avr
--- gcc/config/avr/t-avr	2011-11-16 18:28:11.000000000 +0530
+++ gcc/config/avr/t-avr	2011-11-16 18:34:34.000000000 +0530
@@ -245,6 +245,7 @@ MULTILIB_MATCHES = \
 	mmcu?avr5=mmcu?atmega32hvb \
 	mmcu?avr5=mmcu?atmega32hvbrevb \
 	mmcu?avr5=mmcu?atmega64hve \
+	mmcu?avr5=mmcu?atmega48hvf \
 	mmcu?avr5=mmcu?at90can32 \
 	mmcu?avr5=mmcu?at90can64 \
 	mmcu?avr5=mmcu?at90pwm216 \