参考：http://arago-project.org/wiki/index.php/Setting_Up_Build_Environment#Point_to_the_toolchain_to_use

1)下载，安装Linaro toolchain

2)设置BBLAYERS

3)设置bitbake 环境变量，修改

MACHINE?=”am57xx-evm”

TOOLCHAIN_PATH?=”/home/john/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf”

bblayes.conf文件的内容

This template file was created by taking the oe-core/meta/conf/bblayers.conf

file and removing the BBLAYERS section at the end.

LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf

changes incompatibly

LCONF_VERSION = “7”

BBPATH = “${TOPDIR}”

BBFILES ?= “”

Layers configured by oe-core-setup script

BBLAYERS += ”

/home/john/tisdk/sources/meta-arago/meta-arago-distro

/home/john/tisdk/sources/meta-arago/meta-arago-extras

/home/john/tisdk/sources/meta-browser

/home/john/tisdk/sources/meta-qt5

/home/john/tisdk/sources/meta-openembedded/meta-networking

/home/john/tisdk/sources/meta-openembedded/meta-python

/home/john/tisdk/sources/meta-openembedded/meta-oe

/home/john/tisdk/sources/meta-openembedded/meta-gnome

/home/john/tisdk/sources/meta-ti

/home/john/tisdk/sources/meta-linaro/meta-linaro-toolchain

/home/john/tisdk/sources/meta-linaro/meta-optee

/home/john/tisdk/sources/oe-core/meta

“