需要提前已按照文档构建好开发环境和安装SDK，本篇依据G2L VLP3.0.3，您可点击文末阅读原文或复制下方链接到浏览器中打开获取。
https://www.renesas.cn/cn/zh/document/rln/rzg-verified-linux-package-v303-release-note-0
方式1示例
A. bitbake编译模块方式
目录和内容参考：
rzg2l_vlp_v3.0.3$ tree meta-renesas/meta-rz-common/recipes-kernel/kernel-module-helloworld/meta-renesas/meta-rz-common/recipes-kernel/kernel-module-helloworld/├── files│ ├── helloworld.c│ └── Makefile└── kernel-module-helloworld.bb
helloworld.c
static int hello_world_init(void){printk("Hello world\n");return 0;}static void hello_world_exit(void){printk("Bye world\n");}module_init(hello_world_init);module_exit(hello_world_exit);MODULE_LICENSE("GPL v2");
Makefile
obj-m := helloworld.oSRC := $(shell pwd)all:make -C $(KERNELSRC) M=$(SRC) modulesinstall:make -C $(KERNELSRC) M=$(SRC) modules_installclean:rm -f *.o *~ core .depend .*.cmd *.ko *.mod.crm -f Module.markers Module.symvers modules.orderrm -rf .tmp_versions Modules.symvers
kernel-module-helloworld.bb
SRC_URI = " \file://helloworld.c \file://Makefile \"S = "${WORKDIR}"EXTRA_OEMAKE = "KERNELDIR=${STAGING_KERNEL_BUILDDIR}"EXTRA_OEMAKE += "CROSS_COMPILE=${CROSS_COMPILE}"KERNEL_MODULE_PACKAGE_SUFFIX = ""do_install() {# Create destination directoryinstall -d ${D}/lib/modules/${KERNEL_VERSION}/extra/# Install kernel moduleinstall -m 644 ${S}/helloworld.ko ${D}/lib/modules/${KERNEL_VERSION}/extra/# Install module symbol fileinstall -m 644 ${S}/Module.symvers ${STAGING_KERNEL_BUILDDIR}/helloworld.symvers}PACKAGES = " \${PN} \"FILES_${PN} = " \/lib/modules/${KERNEL_VERSION}/extra/helloworld.ko \
编译模块：
~/rzg2l_vlp_v3.0.3$ source poky/oe-init-build-env### Shell environment set up for builds. ###You can now run 'bitbake' Targets are:core-image-minimalcore-image-bspcore-image-westoncore-image-qthank@rz:~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l bitbake -s | grep hellogo-helloworld :0.1-r0kernel-module-helloworld :1.0-r0lib32-go-helloworld :0.1-r0hank@rz:~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l bitbake kernel-module-helloworldWARNING: Layer qt5-layer should set LAYERSERIES_COMPAT_qt5-layer in its conf/layer.conf file to list the core layer names it is compatible with.WARNING: Layer qt5-layer should set LAYERSERIES_COMPAT_qt5-layer in its conf/layer.conf file to list the core layer names it is compatible with.Loading cache: 100%…NOTE: Tasks Summary: Attempted 650 tasks of which 635 didn't need to be rerun and all succeeded.
查看结果：
build/tmp/work/smarc_rzg2l-poky-linux/kernel-module-helloworld/1.0-r0/helloworld.ko如果想编译到rootfs，请修改conf/local.conf追加内容并重新编译rootfs
MACHINE_EXTRA_RRECOMMENDS = " kernel-module-helloworld"库文件包已含在rootfs内
build$ find ./tmp/work/smarc_rzg2l-poky-linux/ -name helloworld.ko./tmp/work/smarc_rzg2l-poky-linux/core-image-qt/1.0-r0/rootfs/lib/modules/5.10.158-cip22-yocto-standard/extra/helloworld.ko./tmp/work/smarc_rzg2l-poky-linux/kernel-module-helloworld/1.0-r0/helloworld.ko
B.在源码目录直接编译方式
cd /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/buildsource /opt/poky_vlp3.0.3/environment-setup-aarch64-poky-linuxsudo chown -R $USER .make scriptsmake preparemkdir hello //并拷贝上边的源码文件/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello$ lshelloworld.c Makefile/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello$ makemake -C /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/usr/src/kernel M=/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello modulesmake[1]: Entering directory '/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build'CC [M] /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello/helloworld.oMODPOST /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello/Module.symversCC [M] /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello/helloworld.mod.oLD [M] /opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello/helloworld.komake[1]: Leaving directory '/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build'hank@rz:/opt/poky_vlp3.0.3/sysroots/aarch64-poky-linux/lib/modules/5.10.158-cip22-yocto-standard/build/hello$ lshelloworld.c helloworld.ko helloworld.mod helloworld.mod.c helloworld.mod.o helloworld.o Makefile modules.order Module.symvers
方式2示例
首先提取内核源码：
~/rzg2l_vlp_v3.0.3$ source poky/oe-init-build-env~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l devtool modify linux-renesasNOTE: Starting bitbake server...……INFO: Adding local source files to srctree...INFO: Copying kernel config to srctreeINFO: Source tree extracted to /home/xxx/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesasWARNING: SRC_URI is conditionally overridden in this recipe, thus several devtool-override-* branches have been created, one for each override that makes changes to SRC_URI. It is recommended that you make changes to the devtool branch first, then checkout and rebase each devtool-override-* branch and update any unique patches there (duplicates on those branches will be ignored by devtool finish/update-recipe)INFO: Recipe linux-renesas now set up to build from /home/xxx/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas
上面最后一行就是Linux内核源码提取后所在目录,即/home/xxx/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas, 然后去这个目录修改代码即可。
进入Linux源码目录下找个目录增加模块代码，这里使用build/workspace/sources/ linux-renesas /drivers/char目录，在该目录下执行mkdir hello创建目录，然后在hello目录下创建以下文件。
~/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas/drivers/char$ tree hello/hello/├── hello.c├── Kconfig└── Makefile
hello.c
static int hello_world_init(void){printk("Hello world\n");return 0;}static void hello_world_exit(void){printk("Bye world\n");}module_init(hello_world_init);module_exit(hello_world_exit);MODULE_LICENSE("GPL v2");
Kconfig
config HELLOtristate 'Create a hello module'default nhelpThis is a module to print Hello World!
Makefile
obj-$(CONFIG_HELLO) += hello.o修改build/workspace/sources/ linux-renesas /drivers/char目录的Kconfig和Makefile：
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfigindex b4e65d1ed..2b96630ab 100644--- a/drivers/char/Kconfig+++ b/drivers/char/Kconfig@@ -508,4 +508,6 @@ config RANDOM_TRUST_BOOTLOADERbelieve its RNG facilities may be faulty. This may also be configuredat boot time with "random.trust_bootloader=on/off".+source "drivers/char/hello/Kconfig"+endmenudiff --git a/drivers/char/Makefile b/drivers/char/Makefileindex ffce287ef..3056303ff 100644--- a/drivers/char/Makefile+++ b/drivers/char/Makefile@@ -47,3 +47,5 @@ obj-$(CONFIG_PS3_FLASH) += ps3flash.oobj-$(CONFIG_XILLYBUS) += xillybus/obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.oobj-$(CONFIG_ADI) += adi.o++obj-$(CONFIG_HELLO) += hello/
返回yocto顶层目录，选择内核配置
~/rzg2l_vlp_v3.0.3/build$ source poky/oe-init-build-env~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l bitbake virtual/kernel -c menuconfig
编译内核
~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l devtool build linux-renesasNOTE: Starting bitbake server...……NOTE: Tasks Summary: Attempted 607 tasks of which 594 didn't need to be rerun and all succeeded.
生成结果
~/rzg2l_vlp_v3.0.3/build$ ls tmp/work/smarc_rzg2l-poky-linux/linux-renesas/5.10.158-cip22+git999-r1/linux-renesas-5.10.158-cip22+git999/drivers/char/hello/built-in.a hello.o modules.order
最后制作补丁，创建自己的layer保存补丁。
~/rzg2l_vlp_v3.0.3$ source poky/oe-init-build-env~/rzg2l_vlp_v3.0.3/build$ bitbake-layers create-layer ../meta-mylayer~/rzg2l_vlp_v3.0.3/build$ bitbake-layers add-layer ../meta-mylayerhank@rz:~/rzg2l_vlp_v3.0.3/build$ tree ../meta-mylayer/../meta-mylayer/├── conf│ └── layer.conf├── COPYING.MIT├── README└── recipes-example└── example└── example_0.1.bb3 directories, 4 files
再次进入源码目录，提交修改，生成补丁
~/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas$ git status .Refresh index: 100% (70807/70807), done.On branch devtoolChanges not staged for commit:(use "git add..." to update what will be committed)(use "git restore..." to discard changes in working directory)modified: drivers/char/Kconfigmodified: drivers/char/MakefileUntracked files:(use "git add..." to include in what will be committed)drivers/char/hello/no changes added to commit (use "git add" and/or "git commit -a")~/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas$ git add ./*The following paths are ignored by one of your .gitignore files:oe-logsoe-workdirUse -f if you really want to add them.~/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas$ git commit -m "add the hello module"[devtool 6dc52bd44] add the hello module5 files changed, 25 insertions(+)create mode 100644 drivers/char/hello/Kconfigcreate mode 100644 drivers/char/hello/Makefilecreate mode 100644 drivers/char/hello/hello.c
切到build目录执行
~/rzg2l_vlp_v3.0.3/build$ MACHINE=smarc-rzg2l devtool finish linux-renesas ../meta-mylayer/NOTE: Starting bitbake server...……Parsing of 2151 .bb files complete (0 cached, 2151 parsed). 5440 targets, 887 skipped, 3 masked, 0 errors.……INFO: Leaving source tree /home/xxx/rzg2l_vlp_v3.0.3/build/workspace/sources/linux-renesas as-is; if you no longer need it then please delete it manually~/rzg2l_vlp_v3.0.3/build$ tree ../meta-mylayer/../meta-mylayer/├── conf│ └── layer.conf├── COPYING.MIT├── README├── recipes-example│ └── example│ └── example_0.1.bb└── recipes-kernel└── linux├── linux-renesas│ ├── 0001-add-the-hello-module.patch│ └── devtool-fragment.cfg└── linux-renesas_%.bbappend6 directories, 7 files
上边patch文件就是修改的内容了。
如需了解更详细的使用方法请参考如下网站：
https://www.renesas.cn/cn/zh/products/microcontrollers-microprocessors/rz-mpus/rzg2l-getting-started
https://renesas.info/wiki/Main_Page
您可复制下方网址到浏览器中打开进入瑞萨中文论坛查看：
https://community-ja.renesas.com/zh/forums-groups/mcu-mpu/
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