Messages in this thread Patch in this message | | | From | Eugeniy Paltsev <> | Subject | Re: [PATCH private 1/3] ARC: allow to overwrite default mcpu compiler flag | Date | Fri, 29 May 2020 12:10:21 +0000 |
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Oooops, this one is duplicate and should be dropped.
--- Eugeniy Paltsev
________________________________________ From: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Sent: Friday, May 29, 2020 14:55 To: linux-snps-arc@lists.infradead.org; Vineet Gupta Cc: linux-kernel@vger.kernel.org; Alexey Brodkin; Eugeniy Paltsev Subject: [PATCH private 1/3] ARC: allow to overwrite default mcpu compiler flag
By default we set -mcpu=xxx compiler flag depending on the CPU ISA version. It's good starting point, however that may be not enough as for some platforms we may want to use some specific 'mcpu' options for better optimization or to workaround HW issues.
We are going to use this option for HSDK-4xD board support. In addition it also allows to awoid patching 'mcpu' in ARC Makefile when we building Linux for some non-standard simulation or FPGA-based platforms.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> --- arch/arc/Kconfig | 7 +++++++ arch/arc/Makefile | 4 ++++ 2 files changed, 11 insertions(+)
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index ff306246d0f8..e7805db10f7a 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -377,6 +377,13 @@ config ARC_HAS_SWAPE bool "Insn: SWAPE (endian-swap)" default y
+config ARC_MCPU_OVERWRITE + string "Overwrite default -mcpu compiler flag" + default "" + help + Overwrite default -mcpu=xxx compiler flag (which is set depending on + the ISA version) with the specified value. + if ISA_ARCV2
config ARC_USE_UNALIGNED_MEM_ACCESS diff --git a/arch/arc/Makefile b/arch/arc/Makefile index 20e9ab6cc521..1b37e44d9b57 100644 --- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -10,8 +10,12 @@ CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux-) endif
cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ +ifeq ($(CONFIG_ARC_MCPU_OVERWRITE),"") cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 cflags-$(CONFIG_ISA_ARCV2) += -mcpu=hs38 +else +cflags-y += $(shell echo $(CONFIG_ARC_MCPU_OVERWRITE)) +endif
ifdef CONFIG_ARC_CURR_IN_REG # For a global register defintion, make sure it gets passed to every file -- 2.21.3
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