Getting Started with Yocto QEMU on Windows Using WSL

sudo apt update
sudo apt upgrade -y

sudo apt install -y build-essential git wget diffstat unzip texinfo gcc-multilib \
  chrpath socat cpio python3 python3-pip python3-pexpect python3-venv xz-utils debhelper \
  libncurses5-dev libssl-dev libelf-dev libxml2-utils bc zstd liblz4-tool

cd ~
git clone [email protected]:bootlin/simplest-yocto-setup.git

cd simplest-yocto-setup
python3 -m venv venv
source venv/bin/activate

# If you do not have kas installed (required once only):
pip install kas

header:
  version: 11

- machine: dogboneblack
+ machine: qemux86
distro: kiss
target:
  - kiss-image

# Simple QEMU x86 machine configuration for Yocto
# Enables simulation with QEMU using a generic 32-bit x86 target.

# require conf/machine/include/tune-i586.inc
require ../../../openembedded-core/meta/conf/machine/include/x86/tune-i586.inc

MACHINE_FEATURES = "pcbios efi usbhost ext2 vfat"
SERIAL_CONSOLES = "115200;ttyS0"

KERNEL_IMAGETYPE = "bzImage"

# Use the default kernel and bootloader from OE-Core
PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto"
PREFERRED_PROVIDER_virtual/bootloader ?= "grub-efi"

# Set root device for QEMU
APPEND = "root=/dev/vda rw console=ttyS0"

# Image types
IMAGE_FSTYPES = "wic.gz"

# QEMU binary
QB_SYSTEM_NAME = "qemu-system-i386"
QB_DEFAULT_KERNEL = "bzImage"
QB_DEFAULT_FSTYPE = "wic.gz"
QB_MEM = "512M"
QB_MACHINE = "-machine pc"
QB_CPU = "-cpu qemu32"
QB_OPT_APPEND = "console=ttyS0"

# Build a simple, minimal root filesystem.
#
# This recipe is a simplified form of core-image-minimal.

SUMMARY = "A simple, minimal image"

IMAGE_INSTALL = "packagegroup-core-boot dropbear sl"

IMAGE_LINGUAS = " "

- inherit core-image
+ inherit core-image extrausers

+ # user: root; password: 1234
+ # The hash can be generated with the command `openssl passwd -1 1234 | sed -e 's/[$`"\\]/\\&/g'`. In production, this should be set via the environment.
+ EXTRA_USERS_PARAMS = "usermod -p '\$1\$HYUAtT4V\$egIyAfSQoAveUkttkzJLl0' root;"

# Use kas to download the required third-party repositories
# (required the first time, or after changes to .config.yaml)
kas checkout

# Set up the build environment
source openembedded-core/oe-init-build-env

# Build the image
bitbake kiss-image

runqemu qemux86 nographic

INIT: version 3.01 booting
Starting udev
[    2.885841] udevd[157]: starting version 3.2.10
[    2.946600] udevd[158]: starting eudev-3.2.10
[    3.361589] EXT4-fs (vda): re-mounted. Opts: (null). Quota mode: disabled.
INIT: Entering runlevel: 5
Configuring network interfaces... ip: RTNETLINK answers: File exists
Starting Dropbear SSH server: dropbear.
Starting syslogd/klogd: done

Keep-it-simple,stupid Linux 1.0 qemux86 /dev/ttyS0

qemux86 login: root
Password:
root@qemux86:~#

# If you are in the build directory, return to the root of the project
pwd # /home/youruser/simplest-yocto-setup

mkdir -p meta-kiss/recipes-example/helloworld/files

#include <iostream>

int main() {
    std::cout << "Hello, world!" << std::endl;
    return 0;
}

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

SUMMARY = "Simple Hello World C++ application"
LICENSE = "MIT"
# The checksum is calculated from the LICENSE file using the command: md5sum meta-kiss/recipes-example/helloworld/files/LICENSE | awk '{print $1}'
LIC_FILES_CHKSUM = "file://LICENSE;md5=5d584f75c9dac80816984cad5f09d576"

SRC_URI = "file://helloworld.cpp file://LICENSE"

S = "${WORKDIR}"

# Work around QA error due to the over-simplistic Makefile:
INSANE_SKIP:${PN} += "ldflags"

FILES:${PN} += "${datadir}/licenses/helloworld/LICENSE"

do_compile() {
    ${CXX} helloworld.cpp -o helloworld
}

do_install() {
    install -d ${D}${bindir}
    install -m 0755 helloworld ${D}${bindir}/
    install -d ${D}${datadir}/licenses/helloworld
    install -m 0644 ${WORKDIR}/LICENSE ${D}${datadir}/licenses/helloworld/
}

- IMAGE_INSTALL = "packagegroup-core-boot dropbear sl"
+ IMAGE_INSTALL = "packagegroup-core-boot dropbear sl helloworld"

bitbake kiss-image

qemux86 login: root
Password:
root@qemux86:~# helloworld
Hello, world!
root@qemux86:~#