diff --git a/meta/conf/machine/include/tune-sh4.inc b/meta/conf/machine/include/tune-sh4.inc
new file mode 100644
index 0000000..56e23b9
--- /dev/null
+++ b/meta/conf/machine/include/tune-sh4.inc
@@ -0,0 +1,34 @@
+DEFAULTTUNE ?= "sh4"
+
+# Pull in sh4 for compatibility...
+require conf/machine/include/sh/arch-sh.inc
+
+TUNEVALID[sh4] = "Enable SH4 optimizations"
+TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "sh4", " -m4", "", d)}"
+
+# NOTE: If you want to optimize to sh4a, conf/machine/include/tune-sh4a.inc.
+# But it is not compatible for sh4.
+# The binary optimized by m4a doesn't operate on sh4. It works on sh4a only.
+TUNEVALID[sh4a] = "Enable SH4a optimizations"
+TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "sh4a", " -m4a", "", d)}"
+
+AVAILTUNES += "sh4 sh4eb sh4a sh4aeb"
+TUNE_FEATURES_tune-sh4 = "sh4"
+TUNE_ARCH_tune-sh4 = "sh4"
+TUNE_PKGARCH_tune-sh4 = "sh4"
+PACKAGE_EXTRA_ARCHS_tune-sh4 = "sh sh4"
+
+TUNE_FEATURES_tune-sh4eb = "sh4 bigendian"
+TUNE_ARCH_tune-sh4eb = "sh4eb"
+TUNE_PKGARCH_tune-sh4eb = "sh4eb"
+PACKAGE_EXTRA_ARCHS_tune-sh4eb = "sheb sh4eb"
+
+TUNE_FEATURES_tune-sh4a = "sh4a"
+TUNE_ARCH_tune-sh4a = "sh4"
+TUNE_PKGARCH_tune-sh4a = "sh4a"
+PACKAGE_EXTRA_ARCHS_tune-sh4a = "sh sh4 sh4a"
+
+TUNE_FEATURES_tune-sh4aeb = "sh4a bigendian"
+TUNE_ARCH_tune-sh4aeb = "sh4eb"
+TUNE_PKGARCH_tune-sh4aeb = "sh4aeb"
+PACKAGE_EXTRA_ARCHS_tune-sh4aeb = "sheb sh4eb sh4aeb"