diff -Naurp binutils/size.c binutils/size.c
--- binutils/size.c	2011-06-07 11:47:11.000000000 -0500
+++ binutils/size.c	2011-06-07 12:23:39.000000000 -0500
@@ -132,6 +132,7 @@ avr_device_t avr[] =
 	{"atxmega128a1",  AVR136K, AVR8K,  AVR2K},
 	{"atxmega128a1u", AVR136K, AVR8K,  AVR2K},
 	{"atxmega128a3",  AVR136K, AVR8K,  AVR2K},
+	{"atxmega128b1",  AVR136K, AVR8K,  AVR2K},
 	{"atxmega128d3",  AVR136K, AVR8K,  AVR2K},
 
 	{"at43usb320",    AVR128K, 608UL,  0UL},
diff -Naurp gas/config/tc-avr.c gas/config/tc-avr.c
--- gas/config/tc-avr.c	2011-06-07 12:05:36.000000000 -0500
+++ gas/config/tc-avr.c	2011-06-07 12:23:39.000000000 -0500
@@ -258,6 +258,7 @@ static struct mcu_type_s mcu_types[] =
   {"atxmega64a1", AVR_ISA_XMEGA,  bfd_mach_avrxmega5},
   {"atxmega64a1u",AVR_ISA_XMEGA,  bfd_mach_avrxmega5},
   {"atxmega128a3", AVR_ISA_XMEGA, bfd_mach_avrxmega6},
+  {"atxmega128b1", AVR_ISA_XMEGA, bfd_mach_avrxmega6},
   {"atxmega128d3", AVR_ISA_XMEGA, bfd_mach_avrxmega6},
   {"atxmega192a3", AVR_ISA_XMEGA, bfd_mach_avrxmega6},
   {"atxmega192d3", AVR_ISA_XMEGA, bfd_mach_avrxmega6},
diff -Naurp gas/doc/c-avr.texi gas/doc/c-avr.texi
--- gas/doc/c-avr.texi	2011-06-07 12:05:36.000000000 -0500
+++ gas/doc/c-avr.texi	2011-06-07 12:23:39.000000000 -0500
@@ -102,8 +102,8 @@ atxmega64a1u).
 
 Instruction set avrxmega6 is for the XMEGA AVR core with up to 256K program
 memory space and less than 64K data space (MCU types: atxmega128a3,
-atxmega128d3, atxmega192a3, atxmega192d3, atxmega256a3, atxmega256a3b,
-atxmega192d3).
+atxmega128d3, atxmega192a3, atxmega128b1, atxmega192d3, atxmega256a3, 
+atxmega256a3b, atxmega192d3).
 
 Instruction set avrxmega7 is for the XMEGA AVR core with up to 256K program
 memory space and greater than 64K data space (MCU types: atxmega128a1,