由于公司用的xilinx产品，大都是老版本，因此在转linux时，为减少切换麻烦，petalinux也是用的2018.3
编译kernel/u-boot/root-fs一切正常，但在编译SDK时，报失败。
失败信息如下：
NOTE: Executing RunQueue Tasks
ERROR: nativesdk-qemu-xilinx-v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0 do_compile: oe_runmake failed
ERROR: nativesdk-qemu-xilinx-v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0 do_compile: Function failed: do_compile (log file is located at /data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/temp/log.do_compile.27743)
ERROR: Logfile of failure stored in: /data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/temp/log.do_compile.27743
Log data follows:
| DEBUG: SITE files ['endian-little', 'common-linux', 'common-glibc', 'bit-64', 'x86_64-linux', 'common']
| DEBUG: Executing shell function do_compile
| NOTE: make -j 12
| GIT ui/keycodemapdb capstone
| Cloning into '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/capstone'...
| fatal: unable to connect to git.qemu.org:
| git.qemu.org[0: 20.218.248.100]: errno=Connection timed out
|
| fatal: clone of 'git://git.qemu.org/capstone.git' into submodule path '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/capstone' failed
| Failed to clone 'capstone'. Retry scheduled
| Cloning into '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/ui/keycodemapdb'...
| fatal: unable to connect to git.qemu.org:
| git.qemu.org[0: 20.218.248.100]: errno=Connection timed out
|
| fatal: clone of 'git://git.qemu.org/keycodemapdb.git' into submodule path '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/ui/keycodemapdb' failed
| Failed to clone 'ui/keycodemapdb'. Retry scheduled
| Cloning into '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/capstone'...
| fatal: unable to connect to git.qemu.org:
| git.qemu.org[0: 20.218.248.100]: errno=Connection timed out
|
| fatal: clone of 'git://git.qemu.org/capstone.git' into submodule path '/data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/capstone' failed
| Failed to clone 'capstone' a second time, aborting
| ./scripts/git-submodule.sh: failed to update modules
|
| Unable to automatically checkout GIT submodules ' ui/keycodemapdb capstone'.
| If you require use of an alternative GIT binary (for example to
| enable use of a transparent proxy), then please specify it by
| running configure by with the '--with-git' argument. e.g.
|
| $ ./configure --with-git='tsocks git'
|
| Alternatively you may disable automatic GIT submodule checkout
| with:
|
| $ ./configure --disable-git-update'
|
| and then manually update submodules prior to running make, with:
|
| $ scripts/git-sbumodule.sh update ui/keycodemapdb capstone
|
| make: *** [Makefile:39: git-submodule-update] Error 1
| ERROR: oe_runmake failed
| WARNING: /data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/temp/run.do_compile.27743:1 exit 1 from 'exit 1'
| ERROR: Function failed: do_compile (log file is located at /data/02.src_code/projects/peta2018_board/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/temp/log.do_compile.27743)
ERROR: Task (virtual:nativesdk:/data/petalinux2018/components/yocto/source/arm/layers/meta-xilinx/meta-xilinx-bsp/recipes-devtools/qemu/qemu-xilinx_2018.3.bb:do_compile) failed with exit code '1'
NOTE: Tasks Summary: Attempted 3177 tasks of which 3091 didn't need to be rerun and 1 failed.
Summary: 1 task failed:
virtual:nativesdk:/data/petalinux2018/components/yocto/source/arm/layers/meta-xilinx/meta-xilinx-bsp/recipes-devtools/qemu/qemu-xilinx_2018.3.bb:do_compile
Summary: There were 2 ERROR messages shown, returning a non-zero exit code.
ERROR: Failed to build project从错误提示来看，是在获取qemu所需要的capstone与keycodemapdb子模块时，获取失败。
通过链接上去取，即返回404，应该是qemu将git都已经切换了，导致子模块均访问不到了。
搜索网络上不少资料，包括配置git的url instead.of等办法，都不太管用，最终研究了一些信息，综合找到了解决办法。
petalinux 2018编译SDK时，出现git://git.qemu.org/capstone.git及git://git.qemu.org/keycodemapdb.git错误时
进入目录：XXX/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3+gitAUTOINC+f70bd86859-r0/git/.git/
修改config文件，从
[submodule "capstone"]
active = true
url = git://git.qemu.org/capstone.git
[submodule "ui/keycodemapdb"]
active = true
url = git://git.qemu.org/keycodemapdb.git
修改为：
[submodule "capstone"]
active = true
url = https://gitlab.com/qemu-project/capstone.git
[submodule "ui/keycodemapdb"]
active = true
url = https://gitlab.com/qemu-project/keycodemapdb.git
然后命令行模式进入目录XXX/build/tmp/work/x86_64-nativesdk-petalinux-linux/nativesdk-qemu-xilinx/v2.11.0-xilinx-v2018.3\+gitAUTOINC\+f70bd86859-r0/git
执行命令
git submodule update
之后，重新在工程目录下执行petalinux-build --sdk即可