1 files changed, 16 insertions, 1 deletions

diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 3d211aa33cd8..97ac58682d0f 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -34,6 +34,8 @@ isa-y			:= $(isa-y)-nofpu
 endif
 endif
 
+isa-y                   := $(isa-y)-up
+
 cflags-$(CONFIG_CPU_SH2)                := $(call cc-option,-m2,)
 cflags-$(CONFIG_CPU_SH2A)               += $(call cc-option,-m2a,) \
                                            $(call cc-option,-m2a-nofpu,)
@@ -46,7 +48,20 @@ cflags-$(CONFIG_CPU_SH4A)		+= $(call cc-option,-m4a,) \
 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mb
 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -ml
 
-cflags-y        += $(call as-option,-Wa$(comma)-isa=$(isa-y),) -ffreestanding
+#
+# -Wa,-isa= tuning implies -Wa,-dsp for the versions of binutils that
+# support it, while -Wa,-dsp by itself limits the range of usable opcodes
+# on certain CPU subtypes. Try the ISA variant first, and if that fails,
+# fall back on -Wa,-dsp for the old binutils versions. Even without DSP
+# opcodes, we always want the best ISA tuning the version of binutils
+# will provide.
+#
+isaflags-y      := $(call as-option,-Wa$(comma)-isa=$(isa-y),)
+
+isaflags-$(CONFIG_SH_DSP)               := \
+        $(call as-option,-Wa$(comma)-isa=$(isa-y),-Wa$(comma)-dsp)
+
+cflags-y        += $(isaflags-y) -ffreestanding
 
 cflags-$(CONFIG_MORE_COMPILE_OPTIONS)   += \
         $(shell echo $(CONFIG_COMPILE_OPTIONS) | sed -e 's/"//g')