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-rw-r--r--conf/machine/include/tune-sh4.inc4
1 files changed, 4 insertions, 0 deletions
diff --git a/conf/machine/include/tune-sh4.inc b/conf/machine/include/tune-sh4.inc
index 5d43e4195e..51b40691bc 100644
--- a/conf/machine/include/tune-sh4.inc
+++ b/conf/machine/include/tune-sh4.inc
@@ -1,3 +1,7 @@
+# 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.
+
TARGET_CC_ARCH = "-ml -m4"
FEED_ARCH = "sh4"
BASE_PACKAGE_ARCH = "sh4"