PetaLinux环境下，也可以使用Yocto/openembedded的bitbake。Xilinx ug1144有详细说明。
为了方便，我编写了以下脚本，导入bitbake需要的环境。将下列脚本保存为sh文件，使用source导入，之后就能使用bitbake。脚本的第一个输入参数是PetaLinux版本号，比如2019.2。如果source时没有提供版本号，而系统有环境变量XILINX_VERSION，脚本就使用XILINX_VERSION作为PetaLinux版本号。如果source时没有提供PetaLinux版本号，系统也没有定义XILINX_VERSION，则缺省使用2019.2作为PetaLinux版本号。

#!/bin/bash
# hankf@xilinx.com

echo -e "\nBegin to run script: $0"
echo "";

# $1: the first argument could be Xilinx Petalinux version.

if [ "$1" = "" ]; then

    if [ "$XILINX_VERSION" = "" ]; then
        XILINX_VERSION=2019.2
    fi
else
    XILINX_VERSION=$1
fi

echo "Use Xilinx version: $XILINX_VERSION"
export XILINX_VERSION

# Xilinx UG1144
# Accessing BitBake in a Project
# 1. Run petalinux-config or petalinux-config --oldconfig or petalinux-config --silentconfig at least once after creating the project, so that the required environment is setup.
# 2. Source the PetaLinux tools script:
# source /opt/Xilinx/peta/$XILINX_VERSION/settings.sh
# 3. Source the Yocto e-SDK:

source /opt/Xilinx/peta/$XILINX_VERSION/components/yocto/source/aarch64/environment-setup-aarch64-xilinx-linux

source /opt/Xilinx/peta/$XILINX_VERSION/components/yocto/source/aarch64/layers/core/oe-init-build-env

export PATH=/opt/Xilinx/peta/$XILINX_VERSION/tools/hsm/bin:$PATH

export BB_ENV_EXTRAWHITE="$BB_ENV_EXTRAWHITE PETALINUX"

# it will enter directory "build"

# To test if the BitBake is available, run:
# bitbake strace

在petalinux工程的目录，使用source执行上述脚本后，会进入build目录。这时可以执行各种bitbake命令，比如执行"bitbake strace"。

为了以后编译PetaLinux编译方便，或者为了创建离线编译环境，可以通过bitbake命令提前下载编译所需要的所有软件包。Yocto 2.5使用命令“bitbake --runall=fetch”， 之前的版本使用命令“bitbake -c fetchall”。 根据 Yocto Project Mega-Manual 的31章，OpenEmbedded提供了一下target系统image的例子。下面是其中一些image的描述。

core-image-base: A console-only image that fully supports the target device hardware.

core-image-clutter: An image with support for the Open GL-based toolkit Clutter, which enables development of rich and animated graphical user interfaces.

core-image-minimal: A small image just capable of allowing a device to boot.

core-image-rt: A core-image-minimal image plus a real-time test suite and tools appropriate for real-time use.

core-image-sato: An image with Sato support, a mobile environment and visual style that works well with mobile devices. The image supports X11 with a Sato theme and applications such as a terminal, editor, file manager, media player, and so forth.

对于core-image-sato，使用命令“bitbake core-image-sato --runall=fetch”可以下载编译core-image-sato所需要的所有软件包。

hankf:~/zcu106_bsp_peta/build$
hankf:~/zcu106_bsp_peta/build$ bitbake core-image-sato --runall fetch
Loading cache: 100% |###########################################################################| Time: 0:00:01
Loaded 3980 entries from dependency cache.
Parsing recipes: 100% |#########################################################################| Time: 0:00:09
Parsing of 2894 .bb files complete (2893 cached, 1 parsed). 3981 targets, 164 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
Initialising tasks: 100% |######################################################################| Time: 0:00:07
NOTE: Executing RunQueue Tasks
NOTE: Tasks Summary: Attempted 484 tasks of which 3 didn‘t need to be rerun and all succeeded.

Xilinx petalinux工程使用的配置名称是petalinux-user-image，使用命令“bitbake petalinux-user-image --runall=fetch”可以下载编译petalinux-user-image所需要的所有软件包。

hankf:~/zcu106_bsp_peta/build$ bitbake petalinux-user-image --runall=fetch
Loading cache: 100% |############################################| Time: 0:00:00
Loaded 3980 entries from dependency cache.
Parsing recipes: 100% |##########################################| Time: 0:00:03
Parsing of 2894 .bb files complete (2893 cached, 1 parsed). 3981 targets, 164 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
Initialising tasks: 100% |#######################################| Time: 0:00:01
NOTE: Executing RunQueue Tasks
NOTE: Tasks Summary: Attempted 252 tasks of which 252 didn‘t need to be rerun and all succeeded.

之后，可以在build/downloads目录下可以看到大量的.tar.gz文件。把这些.tar.gz文件，拷贝到一个目录，然后设置工程使用本地下载的文件。具体设置，可以参考 整合Xilinx PetaLinux工程编译和Open Source U- Boot/Linux编译.

PetaLinux使用bitbake提前下载所有软件包