Kbuild: introduce Makefile in arch/$ARCH/

Introduce a Makefile under arch/$ARCH/ and include it in the
top Makefile (similar to Linux kernel). This allows further
refactoringi like moving architecture-specific code out of global
makefiles, deprecating config variables (CPU, CPUDIR, SOC) or
deprecating arch/$ARCH/config.mk.

In contrary to Linux kernel, U-Boot defines the ARCH variable by
Kconfig, thus the arch Makefile can only included conditionally
after the top config.mk.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Acked-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
new file mode 100644
index 0000000..ebb7dc3
--- /dev/null
+++ b/arch/arm/Makefile
@@ -0,0 +1,29 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+head-y := arch/arm/cpu/$(CPU)/start.o
+
+ifeq ($(CONFIG_SPL_BUILD),y)
+ifneq ($(CONFIG_SPL_START_S_PATH),)
+head-y := $(CONFIG_SPL_START_S_PATH:"%"=%)/start.o
+endif
+endif
+
+libs-y += arch/arm/cpu/$(CPU)/
+libs-y += arch/arm/cpu/
+libs-y += arch/arm/lib/
+
+ifeq ($(CONFIG_SPL_BUILD),y)
+ifneq (,$(CONFIG_MX23)$(CONFIG_MX35)$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35))
+libs-y += arch/arm/imx-common/
+endif
+else
+ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35 mxs vf610))
+libs-y += arch/arm/imx-common/
+endif
+endif
+
+ifneq (,$(filter $(SOC), armada-xp kirkwood))
+libs-y += arch/arm/mvebu-common/
+endif