# Yocto 支持 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) Qualcomm Linux `meta-qcom-hwe` 层支持 `linux-kernel-qcom` recipe，该 recipe 会获取和编译适用于受支持的机器的 Linux 内核。 有关可用 recipe 的详细信息，参见[编译 Yocto 镜像 recipe 和内核配置](https://docs.qualcomm.com/doc/80-70014-3Y/topic/getting_started_chapter2.html#kernel-configuration1)章节。 ## 内核源代码 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 内核源代码可作为 BitBake 编译版本的一部分从 Codelinaro 存储库中获取。 **Yocto 内核** $ MACHINE=qcm6490 DISTRO=qcom-wayland source setup-environment $ bitbake qcom-console-image # kernel source is downloaded under following location $ ls build-qcom-wayland/tmp-glibc/work-shared/qcm6490/kernel-source/ arch Documentation ipc MAINTAINERS samples virt block drivers Kbuild Makefile scripts certs fs Kconfig mm security COPYING include kernel net sound CREDITS init lib README tools crypto io_uring LICENSES rust usrCopy to clipboard 有关设置和获取源代码的详细信息，参见 [Qualcomm Linux 编译指南](bundle/publicresource/topics/80-70014-254)。 ## 内核 recipe Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) Qualcomm Linux 维护 `meta-qcom-hwe` 层，并将内核 recipe 存放在 ` meta-qcom-hwe/recipes-kernel/linux/linux-kernel-qcom_6.6.bb` 文件中。 `PREFERRED_PROVIDER_virtual/kernel` 在 `meta-qcom-hwe/conf/machine/include/qti-common.inc` 文件中被定义为 `linux-kernel-qcom`。对 `virtual/kernel` 的所有引用都指向 `linux-kernel-qcom` recipe 文件。 如需获取内核 recipe，运行以下命令： $ MACHINE=qcm6490 DISTRO=qcom-wayland source setup-environment $ bitbake qcom-console-image # kernel recipe location $ ls -l meta-qcom-hwe/recipes-kernel/linux/ linux-kernel-headers-install_6.6.bb linux-kernel-qcom linux-kernel-qcom_6.6.bb linux-kernel-qcom-headers_6.6.bbCopy to clipboard ## 解包内核源代码 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 在克隆元数据层后，可以解包内核源代码，以便进行开发和定制。 解包源代码可使用下列命令： # unpack kernel $ devtool modify linux-kernel-qcom # Fetch and set up kernel repository at build-qcom-wayland/workspace/sources/linux-kernel-qcom # Creates a bbappend recipe at build-qcom-wayland/workspace/appends/linux-kernel-qcom_6.6.bbappend # and also adds build-qcom-wayland/workspace to conf/bblayers.conf $ ls build-qcom-wayland/workspace/ appends/ conf/ .devtool_md5 README sources/ $ ls build-qcom-wayland/workspace/appends linux-kernel-qcom_6.6.bbappend $ ls build-qcom-wayland/workspace/conf layer.conf # kernel source repository $ ls build-qcom-wayland/workspace/sources/ linux-kernel-qcomCopy to clipboard 运行命令后，BitBake 会从工作区选取内核，并应用 `bbappend` recipe。 ## 更改内核 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 内核的更改或定制在 `build-qcom-wayland/workspace/sources/linux-kernel-qcom` 工作区完成。 若要修改内核配置，可运行以下命令： # Modify sources in build-qcom-wayland/workspace/sources/linux-kernel-qcom, or update kernel configuration by running makemenufonfig $ devtool menuconfig linux-kernel-qcom # config fragment is updated in following location $ ls build-qcom-wayland/workspace/sources/linux-kernel-qcom/oe-local-files/devtool-fragment.cfg devtool-fragment.cfg # you may do other changes to kernel and commitCopy to clipboard ## 提交内核更改 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 使用下列 Git 命令提交修改： $ cd build-qcom-wayland/workspace/sources/linux-kernel-qcom $ git add . $ git commit -s -m "my changes"Copy to clipboard ## 编译内核镜像 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 更改完成后，可以按照以下步骤编译内核和镜像： # to build kernel use $ devtool build linux-kernel-qcom # and following to build the image $ devtool build-image qcom-console-image # built images are produced in standard location $ ls build-qcom-wayland/tmp-glibc/deploy/images/qcm6490/Copy to clipboard ## 维护内核更改 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 使用 Devtool 开发和导出补丁，并在 `meta-mylayer` 层创建附加文件；若要创建自己的层，首先需将其添加到主机内核 `bbappend` 文件并进行更改。 运行下列命令，在元数据层创建并添加内核补丁： # create your own layer first and add it to host kernel bbappend and changes $ bitbake-layers create-layer ~/meta-mylayer # mkdir -p ~/meta-mylayer/recipes-kernel/linux/linux-kernel-qcom $ bitbake-layers add-layer ~/meta-mylayer # following would update the meta-mylayer recipe and the change $ devtool finish linux-kernel-qcom ~/meta-mylayer # devtool finish shall populate the meta-mylayer recipes along with patches, $ ls -R meta-mylayer/recipes-kernel/ meta-mylayer/recipes-kernel/: linux meta-mylayer/recipes-kernel/linux: linux-kernel-qcom linux-kernel-qcom_%.bbappend meta-mylayer/recipes-kernel/linux/linux-kernel-qcom: 0001-my-patch.patch devtool-fragment.cfg $ less meta-mylayer/recipes-kernel/linux/linux-kernel-qcom_%.bbappend FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:" SRC_URI += "file://devtool-fragment.cfg \ file://0001-my-patch.patch"Copy to clipboard 执行 `devtool finish` 命令后，`~/meta-mylayer` 层更新如下： - 相应的内核更改将作为补丁存放在 `meta-mylayer/recipes-kernel/linux/linux-kernel-qcom/*.patch` 中。 - 添加和更新 `meta-mylayer/recipes-kernel/linux/linux-kernel-qcom_%.bbappend SRC_URI` 以及这些补丁。 - `build-qcom-wayland/workspace` 在开发完成后可以移除。 ## 清理工作区 Source: [https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html](https://docs.qualcomm.com/doc/80-70014-3Y/topic/yocto-kernel-support.html) 使用以下 Devtool 和 BitBake 命令清理工作区： # to remove layer $ bitbake-layers remove-layer ~/meta-mylayer # to clean complete work space $ bitbake -c cleanall recipe # reset using Devtool $ devtool reset linux-kernel-qcom # manually delete the workspace directory $ rm -rf build-qcom-wayland/workspace/sources/linux-kernel-qcom Copy to clipboard Last Published: Aug 22, 2024 [Previous Topic 功能](https://docs.qualcomm.com/bundle/publicresource/80-70014-3Y/topics/features.md) [Next Topic 定制](https://docs.qualcomm.com/bundle/publicresource/80-70014-3Y/topics/customize.md)