A couple of arch directories in Linux are biarch, that is, a single
arch/*/ directory supports both 32-bit and 64-bit.
In old days of Linux, they started as separated directories.
arm/arm64 is the exceptional case, but the other architectures were
unified.
e.g.)
arch/i386, arch/x86_64 -> arch/x86
arch/sh, arch/sh64 -> arch/sh
arch/sparc, arch/sparc64 -> arch/sparc
Linux commit 6752ed90da03 ("Kbuild: allow arch/xxx to use a different
source path") introduced SRCARCH to point to the arch directory, still
allowing to pass in the former ARCH=i386 or ARCH=x86_64.
The top Makefile in Linux converts ARCH to SRCARCH as follows:
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
SRCARCH := x86
endif
So, if you follow the upstream Kbuild convention, using arch/$(SRCARCH)
is the correct way to point to the arch directory.
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
Makefile | 26 +++++++++++++-------------
images/Makefile | 6 +++---
scripts/Makefile.build | 2 +-
3 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/Makefile b/Makefile
index e01a7491a..477741a72 100644
--- a/Makefile
+++ b/Makefile
@@ -307,8 +307,8 @@ export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_ve
# Needed to be compatible with the O= option
LINUXINCLUDE := -Iinclude -I$(srctree)/dts/include \
$(if $(KBUILD_SRC), -I$(srctree)/include) \
- -I$(srctree)/arch/$(ARCH)/include \
- -I$(objtree)/arch/$(ARCH)/include \
+ -I$(srctree)/arch/$(SRCARCH)/include \
+ -I$(objtree)/arch/$(SRCARCH)/include \
-include $(srctree)/include/linux/kconfig.h
KBUILD_CPPFLAGS := -D__KERNEL__ -D__BAREBOX__ $(LINUXINCLUDE) -fno-builtin -ffreestanding
@@ -424,7 +424,7 @@ ifeq ($(config-targets),1)
# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
-include $(srctree)/arch/$(ARCH)/Makefile
+include $(srctree)/arch/$(SRCARCH)/Makefile
export KBUILD_DEFCONFIG
config: scripts_basic outputmakefile FORCE
@@ -452,7 +452,7 @@ endif
# Objects we will link into barebox / subdirs we need to visit
common-y := common/ drivers/ commands/ lib/ crypto/ net/ fs/ firmware/
-include $(srctree)/arch/$(ARCH)/Makefile
+include $(srctree)/arch/$(SRCARCH)/Makefile
ifeq ($(dot-config),1)
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
@@ -520,7 +520,7 @@ export KBUILD_IMAGE ?= barebox.bin
export KBUILD_BINARY ?= barebox.bin
# KBUILD_IMAGE and _BINARY may be overruled on the command line or
# set in the environment.
-# Also any assignments in arch/$(ARCH)/Makefile take precedence over
+# Also any assignments in arch/$(SRCARCH)/Makefile take precedence over
# the default value.
barebox-flash-image: $(KBUILD_IMAGE) FORCE
@@ -574,7 +574,7 @@ export DEFAULT_COMPRESSION_SUFFIX
# ---------------------------------------------------------------------------
# barebox is built from the objects selected by $(barebox-init) and
# $(barebox-main). Most are built-in.o files from top-level directories
-# in the kernel tree, others are specified in arch/$(ARCH)Makefile.
+# in the kernel tree, others are specified in arch/$(SRCARCH)/Makefile.
# Ordering when linking is important, and $(barebox-init) must be first.
#
# FIXME: This picture is wrong for barebox. We have no init, driver, mm
@@ -601,7 +601,7 @@ export BAREBOX_PBL_OBJS := $(pbl-common-y)
BAREBOX_LDS := $(lds-y)
# Rule to link barebox
-# May be overridden by arch/$(ARCH)/Makefile
+# May be overridden by arch/$(SRCARCH)/Makefile
quiet_cmd_barebox__ ?= LD $@
cmd_barebox__ ?= $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_barebox) -o $@ \
-T $(BAREBOX_LDS) \
@@ -742,7 +742,7 @@ UIMAGE_BASE ?= $(shell printf "0x%08x" $$(($(CONFIG_TEXT_BASE) - 0x200000)))
# For development provide a target which makes barebox loadable by an
# unmodified u-boot
quiet_cmd_barebox_mkimage = MKIMAGE $@
- cmd_barebox_mkimage = $(srctree)/scripts/mkimage -A $(ARCH) -T firmware -C none \
+ cmd_barebox_mkimage = $(srctree)/scripts/mkimage -A $(SRCARCH) -T firmware -C none \
-O barebox -a $(UIMAGE_BASE) -e $(UIMAGE_BASE) \
-n "barebox $(KERNELRELEASE)" -d $< $@
@@ -851,9 +851,9 @@ prepare0: archprepare FORCE
prepare prepare-all: prepare0
# Leave this as default for preprocessing barebox.lds.S, which is now
-# done in arch/$(ARCH)/kernel/Makefile
+# done in arch/$(SRCARCH)/kernel/Makefile
-export CPPFLAGS_barebox.lds += -C -U$(ARCH)
+export CPPFLAGS_barebox.lds += -C -U$(SRCARCH)
define symlink-config-h
if [ -f $(srctree)/$(BOARD)/config.h ]; then \
@@ -1052,7 +1052,7 @@ rpm: include/config/kernel.release FORCE
# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------
-boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
+boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
boards := $(sort $(notdir $(boards)))
help:
@@ -1080,9 +1080,9 @@ help:
@echo ' checkstack - Generate a list of stack hogs'
@echo ' namespacecheck - Name space analysis on compiled kernel'
@echo ''
- @echo 'Architecture specific targets ($(ARCH)):'
+ @echo 'Architecture specific targets ($(SRCARCH)):'
@$(if $(archhelp),$(archhelp),\
- echo ' No architecture specific help defined for $(ARCH)')
+ echo ' No architecture specific help defined for $(SRCARCH)')
@echo ''
@$(if $(boards), \
$(foreach b, $(boards), \
diff --git a/images/Makefile b/images/Makefile
index fe29c75e2..0aa4676ae 100644
--- a/images/Makefile
+++ b/images/Makefile
@@ -50,7 +50,7 @@ quiet_cmd_objcopy_bin = OBJCOPYB $@
pbl-lds := $(obj)/pbl.lds
extra-y += $(pbl-lds)
-$(pbl-lds): $(obj)/../arch/$(ARCH)/lib/pbl.lds.S FORCE
+$(pbl-lds): $(obj)/../arch/$(SRCARCH)/lib/pbl.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)
quiet_cmd_elf__ ?= LD $@
@@ -139,8 +139,8 @@ $(obj)/%.img: $(obj)/$$(FILE_$$(@F))
$(Q)if [ -z $(FILE_$(@F)) ]; then echo "FILE_$(@F) empty!"; false; fi
$(call if_changed,shipped)
-board = $(srctree)/arch/$(ARCH)/boards
-objboard = $(objtree)/arch/$(ARCH)/boards
+board = $(srctree)/arch/$(SRCARCH)/boards
+objboard = $(objtree)/arch/$(SRCARCH)/boards
include $(srctree)/images/Makefile.am33xx
include $(srctree)/images/Makefile.am35xx
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 601a4d9cd..57c946769 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -175,7 +175,7 @@ cmd_modversions = \
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
$(CPP) -D__GENKSYMS__ $(c_flags) $< \
| $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
- -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
+ -T $(@D)/$(@F:.o=.symtypes)) \
> $(@D)/.tmp_$(@F:.o=.ver); \
\
$(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
--
2.25.1
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