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호스트환경에서의 module install path 설정
커널빌드시 Makefile 은 target 에 modules 을 설치하는 modules_install 이라는 명령어가 존재한다.
해당명령어는 기본적으로 modules는 /lib/modules 디렉토리에 설치하게 된다. 만약, 호스트 환경에서 커널컴파일이나 모듈을 따로빌드 하게되면 호스트의 /lib/modules 에 설치하게되는데 호스트의 시스템에 영향을 주게된다.
크로스 컴파일환경에서는 make modules_install 할때 약간의 옵션을 줘서 우리가 원하는 디렉토리에 modules 파일들을 떨궈야 한다.
INSTALL_MOD_PATH 옵션 사용
make 할때 INSTALL_MOD_PATH 인자를 주면된다.
$ make ARCH=arm CROSS_COMPILE=arm-linux- INSTALL_MOD_PATH=${PRJROOT}/images/modules-2.6.20 modules_install
modules_install명령어 사용시 modules.dep 파일도 생성이 되어 정상적으로 타겟보드에서 modprobe 명령도 쓸수있게 된다.
관련 레퍼런스
--- 2.3 Targets
When building an external module, only a subset of the "make"
targets are available.
make -C $KDIR M=$PWD [target]
The default will build the module(s) located in the current
directory, so a target does not need to be specified. All
output files will also be generated in this directory. No
attempts are made to update the kernel source, and it is a
precondition that a successful "make" has been executed for the
kernel.
modules
The default target for external modules. It has the
same functionality as if no target was specified. See
description above.
modules_install
Install the external module(s). The default location is
/lib/modules/<kernel_release>/extra/, but a prefix may
be added with INSTALL_MOD_PATH (discussed in section 5).
clean
Remove all generated files in the module directory only.
help
List the available targets for external modules.
--- 5.1 INSTALL_MOD_PATH
Above are the default directories but as always some level of
customization is possible. A prefix can be added to the
installation path using the variable INSTALL_MOD_PATH:
$ make INSTALL_MOD_PATH=/frodo modules_install
=> Install dir: /frodo/lib/modules/$(KERNELRELEASE)/kernel/
INSTALL_MOD_PATH may be set as an ordinary shell variable or,
as shown above, can be specified on the command line when
calling "make." This has effect when installing both in-tree
and out-of-tree modules.
--- 5.2 INSTALL_MOD_DIR
External modules are by default installed to a directory under
/lib/modules/$(KERNELRELEASE)/extra/, but you may wish to
locate modules for a specific functionality in a separate
directory. For this purpose, use INSTALL_MOD_DIR to specify an
alternative name to "extra."
$ make INSTALL_MOD_DIR=gandalf -C $KDIR \
M=$PWD modules_install
=> Install dir: /lib/modules/$(KERNELRELEASE)/gandalf/
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