在开发过程中, 我们比较推荐使用这个文档 在yocto中进行kernel/u-boot开发 的方式来修改源码 。

首先，如果你还不在yocto的开发环境下的话，需要导入编译环境，如：

. sources/poky/oe-init-build-env

查找你想要看源代码的包的名称

bitbake -s | grep

然后进入这个软件包的源码目录，以下以barebox和kernel为例：

使用以下命令会进入barebox源码的路径下

bitbake barebox -c devshell

使用以下命令会进入kernel源码的路径下。

其中内核包名称是指BSP中的内核包的名称，如下表中的linux-mainline / linux-ti / linux-imx 等。

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平台BSP下载最新的meta-phytec tagyoctokernelBootloaderQTAM65xALPHA4 3.1 Dunfelllinux-phytec-ti BSP-Yocto-TISDK-AM65xx-ALPHA4uboot-phytec BSP-Yocto-TISDK-AM65xx-ALPHA4AM57xPD18.1.0 BSP-Yocto-TISDK-AM57xx-PD18.1.02.2 Mortylinux-phytec-ti v4.9.41-phy1uboot-phytec v2017.01-phy15.7AM57xPD18.2.0 BSP-Yocto-TISDK-AM57xx-PD18.2.02.2 Mortylinux-phytec-ti v4.9.41-phy4uboot-phytec v2017.01-phy45.7AM57xPD19.1.1 BSP-Yocto-TISDK-AM57xx-PD19.1.12.6 Thudlinux-phytec-ti BSP-Yocto-TISDK-AM57xx-PD19.1.1uboot-phytec BSP-Yocto-TISDK-AM57xx-PD19.1.1AM57xPD20.1.2 BSP-Yocto-TISDK-AM57xx-PD20.1.22.6 Thudlinux-phytec-ti BSP-Yocto-TISDK-AM57xx-PD20.1.2uboot-phytec BSP-Yocto-TISDK-AM57xx-PD20.1.25.11AM335xPD16.2.0 2.1.2-phy12.1 Krogothlinux-ti v4.4.19-phy2barebox v2016.07.0-phy35.6AM335xPD17.1.3 2.2.4-phy42.2 Mortylinux-ti v4.4.141-phy2barebox v2017.06.1-phy45.7AM335xPD17.2.0 2.3.2-phy22.3 Pyrolinux-mainline v4.9.47-phy25.8AM335xPD17.2.1 2.3.3-phy12.3 Pyrolinux-mainline v4.9.47-phy2barebox v2017.10.0-phy25.8AM335xPD17.2.2 2.3.3-phy22.3 Pyrolinux-mainline v4.9.98-phy1barebox v2017.10.0-phy35.8AM335xPD19.1.0 2.5.2-phy22.5 Sumolinux-mainline v4.14.78-phy4barebox v2018.11.0-phy25.10AM335xPD19.1.1 2.5.3-phy72.5 Sumolinux-mainline v4.14.78-phy6barebox v2018.11.0-phy35.10i.MX6Mira HTML5 v1.0

2.2.1-phy1linux-mainline v4.1.36-phy3barebox v2016.11.0-phy4i.MX6PD15.3.0 1.8.1-phy61.8 Fidolinux-mainline v4.1.18-phy4barebox v2015.11.0-phy4i.MX6PD15.3.1 1.8.1-phy6-fix11.8 Fidolinux-mainline v4.1.18-phy5barebox v2015.11.0-phy4i.MX6PD16.1.0 2.1.2-phy42.1 Krogothlinux-mainline v4.1.36-phy3barebox v2016.11.0-phy75.6i.MX6PD16.1.1 2.1.3-phy52.1 Krogothlinux-mainline v4.1.46-phy2barebox v2016.11.0-phy75.6i.MX6PD16.1.2 2.1.3-phy82.1 Krogothlinux-mainline v4.1.46-phy4barebox v2016.11.0-phy85.6i.MX6PD18.1.0 2.4.3-phy42.4 Rockolinux-mainline v4.14.39-phy4barebox v2017.12.0-phy35.9i.MX6PD18.1.1 2.4.4-phy22.4 Rockolinux-mainline v4.14.78-phy2barebox v2017.12.0-phy35.9i.MX6PD18.1.2 2.4.4-phy62.4 Rockolinux-mainline v4.14.134-phy2barebox v2017.12.0-phy65.9i.MX6PD20.1.0 2.7.4-phy22.7 Warriorlinux-mainline v4.19.100-phy3barebox v2019.11.0-phy25.12i.MX6PD21.1.0 3.3.3-phy23.3 Hardknottlinux-mainline v5.10.48-phy2barebox v2021.04.0-phy45.15i.MX6ulPD17.2.0 2.2.2-phy52.2 Mortylinux-mainline v4.12.4-phy4barebox v2017.04.0-phy35.7i.MX6ulPD17.1.2 2.2.2-phy32.2 Mortylinux-imx v4.1.15-phy3

barebox v2017.04.0-phy35.7i.MX6ulPD19.1.0 2.5.3-phy62.5 Sumolinux-mainline v4.14.93-phy3

barebox v2019.01.0-phy35.10i.MX6ulPD19.1.1 2.5.3-phy162.5 Sumolinux-mainline v4.14.184-phy1barebox v2019.01.0-phy75.10i.MX6ulPD19.1.2 2.5.3-phy192.5 Sumolinux-mainline v4.14.213-phy1barebox v2019.01.0-phy95.10i.MX6ulPD21.1.0 3.1.5-phy13.1 Dunfelllinux-mainline v5.4.91-phy1barebox v2020.09.0-phy35.14i.MX6ulPD22.1.1 BSP-Yocto-Ampliphy-i.MX6UL-PD22.1.14.0 Kirkstonelinux-mainline v5.15.102-phy1barebox v2022.02.0-phy15.15i.MX7PD18.1.1 v2.2.3-phy3linux-phytec-fsl v4.9.11i.MX7PD18.2.0 v2.2.3-phy52.2 Mortylinux-phytec-fsl v4.9.11-phy3u-boot v2017.03-phy25.8i.MX7PD19.1.0 v2.5-phy22.6 Thudlinux-phytec-fsl v4.14.78u-boot v2018.03i.MX8MPD19.1.0 2.5.3-phy122.5 Sumolinux-imx v4.14.98-phy4u-boot-imx v2018.03-phy45.10i.MX8MMPD20.1.0 2.7.1-phy22.7 Warriorlinux-imx v4.19.35_1.1.0-phy4u-boot-imx v2019.04_1.1.0-phy55.12i.MX8MMPD22.1.1 BSP-Yocto-NXP-i.MX8MM-PD22.1.13.3 Hardknottlinux-imx v5.10.72_2.2.0-phy17u-boot-imx v2021.04_2.2.0-phy135.15i.MX8MPALPHA2 3.0 Zeuslinux-imx v5.4.70_2.3.0-phy5u-boot-imx v2020.04_2.3.0-phy3i.MX8MPPD21.1.0 3.0.4-phy123.0 Zeuslinux-imx v5.4.70_2.3.2-phy3u-boot-imx v2020.04_2.3.2-phy35.15i.MX8MPPD21.1.1 v3.0.4-phy153.0 Zeuslinux-imx v5.4.70_2.3.2-phy5u-boot-imx v2020.04_2.3.2-phy35.15i.MX8MPPD21.1.3 BSP-Yocto-FSL-i.MX8MP-PD21.1.33.0 Zeuslinux-imx v5.4.70_2.3.2-phy12u-boot-imx v2020.04_2.3.2-phy105.15i.MX8MPPD22.1.0 BSP-Yocto-NXP-i.MX8MP-PD22.1.03.3 Hardknottlinux-imx v5.10.72_2.2.0-phy9u-boot-imx v2021.04_2.2.0-phy75.15i.MX8MPPD22.1.1 BSP-Yocto-NXP-i.MX8MP-PD22.1.13.3 Hardknottlinux-imx v5.10.72_2.2.0-phy17u-boot-imx v2021.04_2.2.0-phy135.15STM32MP1PD20.1.0 2.6.3-phy42.6 Thudlinux-stm32mp v4.19.94u-boot v2018.115.11RK3288PD17.1.1 2.2.1-phy32.2 Mortylinux-mainline v4.9.18-phy1barebox v2016.07.0-phy5

u-boot-spl v2016.01-phy3

5.7RK3288PD17.1.3 2.2.4-phy62.2 Mortylinux-mainline v4.9.98-phy2barebox v2016.07.0-phy5

u-boot-spl v2016.01-phy3

5.7RK3288PD-ALPHA2 2.1.1-phy12.1 Krogothlinux-mainline v4.4.16-phy2barebox v2016.07.0-phy2

u-boot-spl v2016.01-phy2

使用以下指令进去源代码的位置：

bitbake 软件包名称 -c devshell

在进入devshell后，会重新打开一个终端窗口，注意在某些情况下这个窗口可能打不开，如ssh到一台编译服务器时，此时请使用tmux或者其他类似软件。

请注意在devshell中只修改源代码，或者你也可以记下源码的位置直接去修改，不要再devshell中执行make / make menuconfig之类的语句。

当修改源码后重新编译使用以下命令来编译：

bitbake 软件包名称 -c compile -f

使用以下指令来生成镜像：

bitbake 软件包名称 -c deploy

使用以下指令来修改menuconfig

bitbake 软件包名称 -c menuconfig

此时会新建一个shell出来，和devshell很像，打开menuconfig，修改后也需要之前的

bitbake 软件包名称 -c compile -f

来编译。

如果在操作过程中出了问题，可以使用

bitbake 软件包名称 -c clean

来删掉源码（注意修改都会丢失，请注意保存），然后再执行前面的编译指令。