arch/arm/mach-octeontx2/config.mk - filogic/uboot - Gitiles

 ifeq ($(CONFIG_ARCH_OCTEONTX2),y)
 PLATFORM_CPPFLAGS += $(call cc-option,-march=armv8.2-a,)
 PLATFORM_CPPFLAGS += $(call cc-option,-mtune=octeontx2,)
 endif
	ifeq ($(CONFIG_ARCH_OCTEONTX2),y)
	PLATFORM_CPPFLAGS += $(call cc-option,-march=armv8.2-a,)
	PLATFORM_CPPFLAGS += $(call cc-option,-mtune=octeontx2,)
	endif