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[makefile] Allow buit-in compilation #8

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[makefile] Allow buit-in compilation #8

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4 changes: 3 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ ARCH ?= $(shell uname -m | sed -e s/arm.*/arm/ -e s/aarch64.*/arm64/)
BUILD_DIR ?= $(PWD)
_BUILD_DIR ?= $(shell readlink -f $(BUILD_DIR))

CONFIG_OF_DTBOCFG ?= m

ifdef KERNEL_SRC
KERNEL_SRC_DIR := $(KERNEL_SRC)
else
Expand All @@ -20,7 +22,7 @@ ifeq ($(ARCH), arm64)
endif
endif

obj-m := dtbocfg.o
obj-$(CONFIG_OF_DTBOCFG) := dtbocfg.o

all:
@# If this is an out-of-tree build, we have to create an empty makefile in the build directory
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29 changes: 28 additions & 1 deletion Readme.md
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Expand Up @@ -41,7 +41,34 @@ When building a kernel, Device-Tree-Overlay option should be enabled.
You can enable the option via `make menu_config` ---> `Device Drivers` ---> `Device Tree and Open Firmware support`
---> `Device Tree overlays`, or by manually addting `CONFIG_OF_OVERLAY=y` in `.config`.

## Builiding dtbocfg
## Builiding dtbocfg in-tree

Clone the git repository in the `drivers/of/` directory in your kernel tree, and add the following in
`drivers/of/Kconfig`:

````
config OF_DTBOCFG
bool
help
Enable configFS control of device tree at runtime
````

and in the `config OF_OVERLAY` block:

````
select OF_DTBOCFG
````

Then in `drivers/of/Makefile`:

````
obj-$(CONFIG_OF_DTBOCFG) += dtbocfg/
````

Then you should be able to build the kernel with the module built-in, with the module auto-selected from the
`OF_OVERLAY` property.

## Builiding dtbocfg as a module

Clone the git repository, and run `make` after modifying it according to your environment.

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