diff mbox series

[private,1/3] ARC: allow to overwrite default mcpu compiler flag

Message ID 20200529115534.22883-3-Eugeniy.Paltsev@synopsys.com
State New
Headers show
Series ARC: [plat-hsdk-4xd] initial port for HSDK-4xD board | expand

Commit Message

Eugeniy Paltsev May 29, 2020, 11:55 a.m. UTC
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(+)

Comments

Eugeniy Paltsev May 29, 2020, 12:10 p.m. UTC | #1
Oooops, this one is duplicate and should be dropped.

---
 Eugeniy Paltsev
diff mbox series

Patch

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