kbuild

How .ko file is built

由 强颜欢笑 提交于 2020-01-02 08:54:22
问题 I am trying to port my own driver to a Beagle board xm arm-cortex-A8 . While porting I am trying to figuring out how the .ko file actually builds. In our Makefile we only have a command to build an .o file. How is a .ko file built? Using linux- 2.6.38.8 kernel and trying to configure my driver for my kernel. 回答1: The kernel kbuild module document has lots of information on how to build an external module. If you have Raspberian or some other embedded ARM Linux, you will need to get the source

ccflag option in Makefile

由 痴心易碎 提交于 2019-12-22 01:29:14
问题 I want to compile my c code (in kernel) which needs to include some header files from another directory. Instead of specifying the complete path to header files in c file, I would like to specify the include path in Makefile. My c file gets complied when the config option CONFIG_FEATURE_X is enabled. I have written the following in Makefile: obj-$(CONFIG_FEATURE_X) += my_file.o ccflags-$(CONFIG_FEATURE_X) += -I$(obj)/../../path When the CONFIG_FEATURE_X is enabled (Y) in .config using make

How does kbuild actually work?

由 夙愿已清 提交于 2019-12-20 09:48:48
问题 When i'm developing a linux driver, i've read about how to write linux kbuild makefile through this document I know kbuild system use makefile variables such as obj-y obj-m to determine what to build and how to build. But what i'm confused about is where does kbuild system really execute build process.In a word, if i have obj-m = a.o , then where does kbuild system parse obj-m and execute gcc a.c ? 回答1: Kbuild's Makefiles aren't the easiest to read, but here's a high-level untangling (using

Linking kernel module with a static lib

由 …衆ロ難τιáo~ 提交于 2019-12-17 19:29:42
问题 I'm trying to link my kernel module with an external static lib, like this: obj-m += my_prog.o my_prog-objs := some/path/lib.a # all the standard targets... For some reasone, the above Makefile doesn't compile my_prog.c at all, and the resulting module doesn't contain its code. Certainly, if I remove my_prog-objs line, my_prog.c gets compiled. What's wrong with such an approach in a Makefile? 回答1: When you create the my_prog-objs list, you tell kbuild to use only the object files in that list

Building an out-of-tree Linux kernel module in a separate object directory

由 北战南征 提交于 2019-12-17 10:44:08
问题 I'm confronting the Linux kernel build system (Kbuild, kernel ≥2.6.28) with the directory structure and build system for a larger project. Our project contains an out-of-tree Linux kernel module, and our directory structure looks like this (simplified, obviously): checkout/src/common/*.c source files (common to Linux and other platforms) checkout/src/linux-driver/*.c source files (for the Linux kernel driver) checkout/build/linux/Kbuild Kbuild tmp/linux-2.6.xx/ where the Linux kernel is

Adding support for menuconfig / Kconfig in my project

由 岁酱吖の 提交于 2019-12-12 08:28:34
问题 I am planning to add support for menuconfig in my project. The project is not associated with Linux kernel so, I have to write everything from scratch in menuconfig and Makefile. How do I add support for menuconfig and create Kconfig and make the makefile read the defines in .config? Any good tutorial to begin with? 回答1: If you are interested on using KBuild/KConfig for your custom applications, you may try the following Github projects. They aim to provide an initial template for projects

In Kernel makefile $(call cmd, tags) what is the cmd here refers to?

由 让人想犯罪 __ 提交于 2019-12-11 09:41:42
问题 In Kernel Makefile i found the code like below: ctags CTAGS CSCOPE: $(HEADERS) $(SOURCES) $(ETAGS) $(ETAGSFALGS) $(HEADERS) $(SOURCES) $(call cmd, ctags) Also, where can i find the Macro or function ? 回答1: Using MadScientist's method on kernel v4.1: make -p | grep -B1 -E '^cmd ' we find: # makefile (from `scripts/Kbuild.include', line 211) cmd = @$(echo-cmd) $(cmd_$(1)) scripts/Kbuild.include is included on the top level Makefile . It also contains: echo-cmd = $(if $($(quiet)cmd_$(1)),\ echo

How .ko file is built

由 本秂侑毒 提交于 2019-12-06 09:11:49
I am trying to port my own driver to a Beagle board xm arm-cortex-A8 . While porting I am trying to figuring out how the .ko file actually builds. In our Makefile we only have a command to build an .o file. How is a .ko file built? Using linux- 2.6.38.8 kernel and trying to configure my driver for my kernel. The kernel kbuild module document has lots of information on how to build an external module. If you have Raspberian or some other embedded ARM Linux, you will need to get the source package for your kernel. The process differs based on whether you are compiling on the same machine the

Adding support for menuconfig / Kconfig in my project

由 不羁岁月 提交于 2019-12-04 03:29:40
I am planning to add support for menuconfig in my project. The project is not associated with Linux kernel so, I have to write everything from scratch in menuconfig and Makefile. How do I add support for menuconfig and create Kconfig and make the makefile read the defines in .config? Any good tutorial to begin with? If you are interested on using KBuild/KConfig for your custom applications, you may try the following Github projects. They aim to provide an initial template for projects using KBuild/KConfig and, therefore, supporting menuconfig. Kbuild skeleton: https://github.com/masahir0y

How to use make and compile as C99?

由 时光怂恿深爱的人放手 提交于 2019-12-03 15:14:17
问题 I'm trying to compile a linux kernel module using a Makefile: obj-m += main.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean Which gives me: main.c:54: warning: ISO C90 forbids mixed declarations and code I need to switch to C99. After reading I noticed I need to add a flag -std=c99, not sure where it suppose to be added. How do I change the Makefile so it will compile as C99? 回答1: It's got nothing to do
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