【工程师分享】在PetaLinux里为模块创建补丁

FPGA开发圈 2020-12-03 00:00

【应用手册】TI 全新MCU及C29内核的能源设施应用方案 【应用手册】TI 全新MCU及C29内核的电动汽车应用方案

作者：付汉杰，hankf@xilinx.com文章转载自：赛灵思中文社区论坛

PetaLinux(Yocto)里包含很多软件模块。大部分模块可以直接使用。如果有特殊需求，需要修改某些模块时，可以按下列办法先修改，测试成功后，再创建补丁，集成到PetaLinux(Yocto)工程里。

比如客户需要修改xorg.conf，可以采用下列方式完成。

0 1

选择工具devtool

缺省情况下，PetaLinux使用bitbake。请在“petalinux-config → Yocto settings → Build tool”里，选择devtool。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-config 
INFO: sourcing build tools
[INFO] menuconfig project
configuration written to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/configs/config

*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.

[INFO] sourcing build environment
[INFO] generating kconfig for Rootfs
[INFO] silentconfig rootfs
[INFO] generating plnxtool conf
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] successfully configured project

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build 
INFO: sourcing build tools
ERROR:  OE-core's config sanity checker detected a potential misconfiguration.
    Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
    Following is the list of potential problems / advisories:

    Error, TMPDIR has changed location. You need to either move it back to /proj/hankf/zcu106/v201/vcu-trd-xv20/build/tmp or delete it and rebuild
Summary: There was 1 ERROR message shown, returning a non-zero exit code.
ERROR: Failed to start bitbake environment
ERROR: Failed to build project

选择devtool，编译报告TMPDIR的错误。之前的TMPDIR设置是工程目录下的“build/tmp”。在执行petalinux-config ，把TMPDIR设置为工程绝对目录，“/proj/hankf/zcu106/v201/vcu-trd-xv20/build/tmp”。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-config 

INFO: sourcing build tools
[INFO] menuconfig project
configuration written to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/configs/config

*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.

[INFO] sourcing build environment
[INFO] generating kconfig for Rootfs
[INFO] silentconfig rootfs
[INFO] generating plnxtool conf
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] successfully configured project

0 2

获取软件包源代码

执行命令“petalinux-build -c -x modify”，可以把源代码下载到workspace目录。执行完成后，目录“components/yocto/workspace/sources”会增加对应的目录和文件。

客户需要修改xorg.conf。以xorg为为软件包名，执行命令“petalinux-build -c xorg -x modify”，petalinux报告找不到软件包。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xorg -x modify
INFO: sourcing build tools
[INFO] building xorg
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] devtool modify xorg
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2965 cached, 2 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
ERROR: Unable to find any recipe file matching "xorg"
ERROR: Failed to build xorg

搜索xorg.conf，可以看到，在目录xserver-xf86-config里有，因此执行命令“petalinux-build -c xserver-xf86-config -x modify”。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ find -name "*org.conf"
./project-spec/meta-user/recipes-graphics/xorg-xserver/xserver-xf86-config/zynqmp/xorg.conf
./components/yocto/layers/meta-xilinx/meta-xilinx-bsp/recipes-graphics/xorg-xserver/xserver-xf86-config/zynqmp/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemumips64/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemuppc/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemumips/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemuarm/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemux86/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemux86-64/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/xorg.conf
./components/yocto/layers/core/meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemush4/xorg.conf

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xserver-xf86-config -x modify
INFO: sourcing build tools
[INFO] building xserver-xf86-config
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] devtool modify xserver-xf86-config
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2965 cached, 2 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
INFO: SRC_URI contains some conditional appends/prepends - will create branches to represent these
NOTE: Resolving any missing task queue dependencies
Initialising tasks: 100% |###################################################################################################################| Time: 0:00:00
Sstate summary: Wanted 0 Found 0 Missed 0 Current 0 (0% match, 0% complete)
NOTE: No setscene tasks
NOTE: Executing Tasks
WARNING: No source unpacked to S - either the xserver-xf86-config recipe doesn't use any source or the correct source directory could not be determined
NOTE: Tasks Summary: Attempted 3 tasks of which 0 didn't need to be rerun and all succeeded.
INFO: Adding local source files to srctree...
INFO: Source tree extracted to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config
WARNING: 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: Using source tree as build directory since that would be the default for this recipe
INFO: Recipe xserver-xf86-config now set up to build from /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config
[INFO] successfully built xserver-xf86-config

执行完成后，在目录

“components/yocto/workspace/sources”下增加了目录“xserver-xf86-config/“以及文件”xorg.conf“。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ ls components/yocto/workspace/sources/xserver-xf86-config/
oe-local-files  xorg.conf

0 3

修改文件

修改相关的文件，比如”xorg.conf“。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ ls components/yocto/workspace/sources/xserver-xf86-config/
oe-local-files  xorg.conf
hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ gedit components/yocto/workspace/sources/xserver-xf86-config/xorg.conf  &
[1] 3463

0 4

测试修改

修改相关的文件，执行命令“petalinux-build -c ”，比如“petalinux-build -c xserver-xf86-config ”，执行编译测试，也可以在单板上测试。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xserver-xf86-config 

INFO: sourcing build tools
[INFO] building xserver-xf86-config
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component xserver-xf86-config already exists in workspace, Using the same...
[INFO] devtool build xserver-xf86-config
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
Removing 1 recipes from the zcu106_zynqmp sysroot: 100% |####################################################################################| Time: 0:00:00
Loading cache: 100% |########################################################################################################################| Time: 0:00:03
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
Initialising tasks: 100% |###################################################################################################################| Time: 0:00:00
Checking sstate mirror object availability: 100% |###########################################################################################| Time: 0:00:00
Sstate summary: Wanted 6 Found 2 Missed 4 Current 59 (33% match, 93% complete)
NOTE: Executing Tasks
NOTE: Setscene tasks completed
NOTE: xserver-xf86-config: compiling from external source tree /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config
NOTE: Tasks Summary: Attempted 459 tasks of which 450 didn't need to be rerun and all succeeded.
INFO: copy to TFTP-boot directory is not enabled !!
[INFO] successfully built xserver-xf86-config
[1]+  Done                    gedit components/yocto/workspace/sources/xserver-xf86-config/xorg.conf

0 5

提交更改

测试通过后，进入对应软件的目录，比如“components/yocto/workspace/sources/xserver-xf86-config”，通过git命令提交更改。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config$ git add xorg.confhankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config$ git commit -s
[devtool 23f4304] test
 1 file changed, 2 insertions(+)
 create mode 100644 test.txt

0 6

生成patch

命令“petalinux-build -c -x update-recipe”会生成patch。

命令“petalinux-build -c -x finish”会生成patch，并在目录workspace删除相关源代码和目录。
creates a patch for the committed changes in recipe sources directory and removes the source from workspace.

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xserver-xf86-config -x update-recipe
INFO: sourcing build tools
[INFO] building xserver-xf86-config
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component xserver-xf86-config already exists in workspace, Using the same...
[INFO] devtool update-recipe xserver-xf86-config -a /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user -w
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
INFO: Handling main branch (devtool)...
INFO: No patches or local source files needed updating
INFO: Handling branch devtool-override-pn-arm-trusted-firmware...
INFO: No patches or local source files needed updating
INFO: Handling branch devtool-override-pn-device-tree...
INFO: No patches or local source files needed updating
INFO: copy to TFTP-boot directory is not enabled !!
[INFO] successfully built xserver-xf86-config

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xserver-xf86-config -x finish
INFO: sourcing build tools
[INFO] building xserver-xf86-config
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component xserver-xf86-config already exists in workspace, Using the same...
[INFO] devtool finish xserver-xf86-config /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user 
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...

Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
INFO: Handling main branch (devtool)...
NOTE: Writing append file /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-graphics/xorg-xserver/xserver-xf86-config_%.bbappend
NOTE: Copying xorg.conf to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-graphics/xorg-xserver/xserver-xf86-config/xorg.conf
INFO: Handling branch devtool-override-pn-arm-trusted-firmware...
INFO: No patches or local source files needed updating
INFO: Handling branch devtool-override-pn-device-tree...
INFO: No patches or local source files needed updating
INFO: Cleaning sysroot for recipe xserver-xf86-config...
INFO: Leaving source tree /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config as-is; if you no longer need it then please delete it manually
[INFO] Removing source tree from workspace: /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config
[INFO] successfully built xserver-xf86-config

执行完成后，目录“project-spec/meta-user/recipes-graphics/xorg-xserver/xserver-xf86-config”下增加了文件xorg.conf。

hankf@XSZGS4:/proj/hankf/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-graphics/xorg-xserver/xserver-xf86-config$ ls -l
total 8
-rw-rw-r-- 1 hankf hankf  765 Nov 27 14:43 xorg.conf
drwxr-xr-x 2 hankf hankf 4096 Nov 27 15:10 zynqmp

0 7

删除软件包

如果测试正常，可以执行命令“petalinux-build -c xserver-xf86-config -x reset”，把软件包从目录workspace删除。ug1144建议使用“devtool reset ”。最好使用“petalinux-build -c xserver-xf86-config -x reset”

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ devtool reset  xserver-xf86-config 
devtool: command not found
hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c xserver-xf86-config -x reset

INFO: sourcing build tools
[INFO] building xserver-xf86-config
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component xserver-xf86-config already exists in workspace, Using the same...
[INFO] devtool reset xserver-xf86-config
NOTE: Starting bitbake server...
INFO: Cleaning sysroot for recipe xserver-xf86-config...
INFO: Leaving source tree /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config as-is; if you no longer need it then please delete it manually
[INFO] Removing source tree from workspace: /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/xserver-xf86-config
[INFO] successfully built xserver-xf86-config

0 8

其它日志

对比下面命令“petalinux-build -c -x update-recipe”和命令“petalinux-build -c -x finish”的结果，命令“petalinux-build -c -x finish”删除了components/yocto/workspace/sources下的目录gstreamer-vcu-notebooks。

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/gstreamer-vcu-notebooks$ git add test.txt

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/gstreamer-vcu-notebooks$ git commit -s
[devtool 23f4304] test
 1 file changed, 2 insertions(+)
 create mode 100644 test.txt

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c gstreamer-vcu-notebooks  -x update-recipe

INFO: sourcing build tools
[INFO] building gstreamer-vcu-notebooks
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component gstreamer-vcu-notebooks already exists in workspace, Using the same...
[INFO] devtool update-recipe gstreamer-vcu-notebooks -a /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user -w
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
INFO: Handling main branch (devtool)...
NOTE: Writing append file /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks_%.bbappend
NOTE: Copying 0001-test.patch to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks/0001-test.patch
INFO: Handling branch devtool-override-pn-arm-trusted-firmware...
INFO: No patches or local source files needed updating
INFO: Handling branch devtool-override-pn-device-tree...
INFO: No patches or local source files needed updating
INFO: copy to TFTP-boot directory is not enabled !!
[INFO] successfully built gstreamer-vcu-notebooks


hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ ls -l ./components/yocto/workspace/sources/gstreamer-vcu-notebooks/
total 20
lrwxrwxrwx 1 hankf hankf   24 Nov 27 16:49 common.py -> oe-local-files/common.py
lrwxrwxrwx 1 hankf hankf   22 Nov 27 16:49 LICENSE -> oe-local-files/LICENSE
drwxr-xr-x 3 hankf hankf 4096 Nov 27 16:30 oe-local-files
lrwxrwxrwx 1 hankf hankf  160 Nov 27 16:36 oe-logs -> /proj/hankf/zcu106/v201/vcu-trd-xv20/build/tmp/work/zynqmpev-xilinx-linux/gstreamer-vcu-notebooks/0.1-r0/temp
lrwxrwxrwx 1 hankf hankf  155 Nov 27 16:36 oe-workdir -> /proj/hankf/zcu106/v201/vcu-trd-xv20/build/tmp/work/zynqmpev-xilinx-linux/gstreamer-vcu-notebooks/0.1-r0
drwxrwxr-x 2 hankf hankf 4096 Nov 27 16:49 pictures
-rw-rw-r-- 1 hankf hankf   11 Nov 27 16:49 test.txt
lrwxrwxrwx 1 hankf hankf   51 Nov 27 16:49 vcu-demo-camera-decode-display.ipynb -> oe-local-files/vcu-demo-camera-decode-display.ipynb
lrwxrwxrwx 1 hankf hankf   58 Nov 27 16:49 vcu-demo-camera-encode-decode-display.ipynb -> oe-local-files/vcu-demo-camera-encode-decode-display.ipynb
lrwxrwxrwx 1 hankf hankf   48 Nov 27 16:49 vcu-demo-camera-encode-file.ipynb -> oe-local-files/vcu-demo-camera-encode-file.ipynb
lrwxrwxrwx 1 hankf hankf   53 Nov 27 16:49 vcu-demo-camera-encode-streamout.ipynb -> oe-local-files/vcu-demo-camera-encode-streamout.ipynb
lrwxrwxrwx 1 hankf hankf   44 Nov 27 16:49 vcu-demo-decode-display.ipynb -> oe-local-files/vcu-demo-decode-display.ipynb
lrwxrwxrwx 1 hankf hankf   53 Nov 27 16:49 vcu-demo-streamin-decode-display.ipynb -> oe-local-files/vcu-demo-streamin-decode-display.ipynb
lrwxrwxrwx 1 hankf hankf   47 Nov 27 16:49 vcu-demo-transcode-to-file.ipynb -> oe-local-files/vcu-demo-transcode-to-file.ipynb
lrwxrwxrwx 1 hankf hankf   52 Nov 27 16:49 vcu-demo-transcode-to-streamout.ipynb -> oe-local-files/vcu-demo-transcode-to-streamout.ipynb

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ petalinux-build -c gstreamer-vcu-notebooks  -x finish
INFO: sourcing build tools
[INFO] building gstreamer-vcu-notebooks
[INFO] sourcing build environment
[INFO] generating user layers
[INFO] generating workspace directory
[INFO] Specified component gstreamer-vcu-notebooks already exists in workspace, Using the same...
[INFO] devtool finish gstreamer-vcu-notebooks /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user 
NOTE: Starting bitbake server...
NOTE: Reconnecting to bitbake server...
NOTE: Retrying server connection (#1)...
NOTE: Reconnecting to bitbake server...
NOTE: Previous bitbake instance shutting down?, waiting to retry...
NOTE: Retrying server connection (#2)...
Loading cache: 100% |########################################################################################################################| Time: 0:00:00
Loaded 4234 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################| Time: 0:00:05
Parsing of 2967 .bb files complete (2964 cached, 3 parsed). 4236 targets, 168 skipped, 0 masked, 0 errors.
INFO: Handling main branch (devtool)...
NOTE: Writing append file /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks_%.bbappend
NOTE: Copying 0001-test.patch to /home/hankf/proj/zcu106/v201/vcu-trd-xv20/project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks/0001-test.patch
INFO: Handling branch devtool-override-pn-arm-trusted-firmware...
INFO: No patches or local source files needed updating
INFO: Handling branch devtool-override-pn-device-tree...
INFO: No patches or local source files needed updating
INFO: Cleaning sysroot for recipe gstreamer-vcu-notebooks...
INFO: Leaving source tree /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/gstreamer-vcu-notebooks as-is; if you no longer need it then please delete it manually
[INFO] Removing source tree from workspace: /home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/gstreamer-vcu-notebooks
[INFO] successfully built gstreamer-vcu-notebooks

hankf@XSZGS4:~/proj/zcu106/v201/vcu-trd-xv20$ ls -l ./components/yocto/workspace/sources/gstreamer-vcu-notebooks/
ls: cannot access '/home/hankf/proj/zcu106/v201/vcu-trd-xv20/components/yocto/workspace/sources/gstreamer-vcu-notebooks/': No such file or directory

另外也可以发现，命令自动创建了文件project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks_%.bbappend，自动复制了文件0001-test.patch到目录project-spec/meta-user/recipes-multimedia/gstreamer/gstreamer-vcu-notebooks。