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linux: add option to enable support for Device Tree overlays

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Add an option to compile device trees in Linux with symbol generation
such that device tree overlays can be loaded on the target system

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
[Arnout: remove "default n" and move setting of LINUX_MAKE_ENV to the
 place where the rest is set.]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Titouan Christophe 2019-01-15 15:15:48 +01:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent 4c8760bdc5
commit eb37deb670
2 changed files with 12 additions and 0 deletions
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8
linux/Config.in
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@ -394,6 +394,14 @@ config BR2_LINUX_KERNEL_CUSTOM_DTS_PATH
You can provide a list of dts paths to copy and
build, separated by spaces.
config BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT
bool "Build Device Tree with overlay support"
help
If enabled, pass the "-@" option to dtc, such that
symbols are generated in the compiled Device Tree.
Choose this option to support Device Tree overlays
on the target system.
endif
config BR2_LINUX_KERNEL_INSTALL_TARGET

4
linux/linux.mk
View file

@ -143,6 +143,10 @@ ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
endif
ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)
LINUX_MAKE_ENV += DTC_FLAGS=-@
endif
# Get the real Linux version, which tells us where kernel modules are
# going to be installed in the target filesystem.
LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`