--- toolchain.eclass.orig	2013-05-24 08:45:23.078823831 +0700
+++ toolchain.eclass	2013-05-24 09:02:37.760326529 +0700
@@ -968,6 +968,7 @@
 				break
 			fi
 		done
+
 		# Convert armv7{a,r,m} to armv7-{a,r,m}
 		[[ ${arm_arch} == armv7? ]] && arm_arch=${arm_arch/7/7-}
 		# See if this is a valid --with-arch flag
@@ -977,6 +978,9 @@
 			confgcc+=( --with-arch=${arm_arch} )
 		fi
 
+		# If arch is arm*-m, use thumb mode only.
+		[[ ${arm_arch} == *-m ]] && confgcc+=( --with-mode=thumb )
+		
 		# Enable hardvfp
 		if [[ $(tc-is-softfloat) == "no" ]] && \
 		   [[ ${CTARGET} == armv[67]* ]] && \