MIPS: Loongson2ef: Disable Loongson MMI instructions

It was missed when I was forking Loongson2ef from Loongson64 but should be applied to Loongson2ef as march=loongson2f will also enable Loongson MMI in GCC-9+. Signed-off-by: Jiaxun Yang <[email protected]> Fixes: 71e2f4d ("MIPS: Fork loongson2ef from loongson64") Reported-by: Thomas Bogendoerfer <[email protected]> Cc: [email protected] # v5.8+ Signed-off-by: Thomas Bogendoerfer <[email protected]>
josf · Sep 23, 2020 · b13812d · b13812d
1 parent 01ce6d4
commit b13812d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arch/mips/loongson2ef/Platform b/arch/mips/loongson2ef/Platform
@@ -44,6 +44,10 @@ ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
   endif
 endif
 
+# Some -march= flags enable MMI instructions, and GCC complains about that
+# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
+cflags-y += $(call cc-option,-mno-loongson-mmi)
+
 #
 # Loongson Machines' Support
 #