Ask for a generic armv8-a encoding rather than one based on and tuned
for cortex-a57.
Index: Makefile.arm64
===================================================================
RCS file: /cvs/src/sys/arch/arm64/conf/Makefile.arm64,v
retrieving revision 1.4
diff -u -p -r1.4 Makefile.arm64
--- Makefile.arm64 25 Jan 2017 11:15:07 -0000 1.4
+++ Makefile.arm64 5 Feb 2017 10:10:31 -0000
@@ -28,7 +28,7 @@ CWARNFLAGS= -Werror -Wall -Wimplicit-fun
-Wno-constant-conversion -Wno-address-of-packed-member \
-Wframe-larger-than=2047
-CMACHFLAGS= -mcpu=cortex-a57+nofp+nosimd \
+CMACHFLAGS= -march=armv8-a+nofp+nosimd \
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer \
-ffixed-x18
CMACHFLAGS+= -ffreestanding ${NOPIE_FLAGS}
