最近在研究yocto，编译前的配置过程中总是提示Permission denied，求助，log如下：
1，执行~/fsl-release-bsp$ MACHINE=imx6qsabresd source fsl-setup-release.sh -b build：
Build directory is build
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6dlsabresd.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6qdlsolo.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6qsabresd.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6slevk.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sx14x14arm2.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sx17x17arm2.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sx19x19ddr3arm2.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sx19x19lpddr2arm2.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sxsabreauto.conf’: Permission denied
cp: cannot create regular file ‘sources/meta-fsl-arm/conf/machine/imx6sxsabresd.conf’: Permission denied
Error: Cannot write to /home/zyz/fsl-release-bsp/build, perhaps try sourcing with a writable path? i.e. . oe-init-build-env ~/my-build
mv: cannot stat ‘conf/local.conf’: No such file or directory
bash: conf/local.conf: No such file or directory
bash: conf/local.conf: No such file or directory
sed: can't read conf/local.conf: No such file or directory
无奈，用root用户执行：
root@zyz-vm:~/fsl-release-bsp# MACHINE=imx6qsabresd source fsl-setup-release.sh -b build
Build directory is build
ERROR: do not use the BSP as root. Exiting...
Configuring for imx6qsabresd
...
这种情况该怎么处理。。。
