114 lines
3.4 KiB
ReStructuredText
114 lines
3.4 KiB
ReStructuredText
.. _using_zephyr_as_uos:
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Using Zephyr as User OS
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#######################
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This tutorial describes how to run Zephyr as the User OS on the ACRN hypervisor. We are using
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Kaby Lake-based NUC (model NUC7i5DNHE) in this tutorial.
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Other :ref:`ACRN supported platforms <hardware>` should work as well.
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Introduction to Zephyr
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**********************
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The Zephyr RTOS is a scalable real-time operating-system supporting multiple hardware architectures,
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optimized for resource constrained devices, and built with safety and security in mind.
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Steps for Using Zephyr as User OS
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*********************************
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#. Build Zephyr
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Follow the `Zephyr Getting Started Guide <https://docs.zephyrproject.org/latest/getting_started/>`_ to
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setup the Zephyr development environment.
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The build process for ACRN UOS target is similar to other boards. We will build the `Hello World
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<https://docs.zephyrproject.org/latest/samples/hello_world/README.html>`_ sample for ACRN:
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.. code-block:: none
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$ cd samples/hello_world
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$ mkdir build && cd build
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$ cmake -DBOARD=acrn ..
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$ make
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This will build the application ELF binary in ``samples/hello_world/build/zephyr/zephyr.elf``.
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#. Build grub2 boot loader image
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We can build grub2 bootloader for Zephyr using ``boards/x86/common/scripts/build_grub.sh``
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which locate in `Zephyr Sourcecode <https://github.com/zephyrproject-rtos/zephyr>`_.
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.. code-block:: none
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$ ./boards/x86/common/scripts/build_grub.sh x86_64
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The EFI executable binary will be found at ``boards/x86/common/scripts/grub/bin/grub_x86_64.efi``.
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#. Preparing the boot device
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.. code-block:: none
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$ dd if=/dev/zero of=zephyr.img bs=1M count=35
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$ mkfs.vfat -F 32 zephyr.img
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$ sudo mount `sudo losetup -f -P --show zephyr.img` /mnt
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Create the following directories.
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.. code-block:: none
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$ sudo mkdir -p /mnt/efi/boot
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$ sudo mkdir -p /mnt/kernel
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Copy ``zephyr.elf`` and ``grub_x86_64.efi``
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.. code-block:: none
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$ sudo cp boards/x86/common/scripts/grub/bin/grub_x86_64.efi /mnt/efi/boot/bootx64.efi
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$ sudo cp samples/hello_world/build/zephyr/zephyr.elf /mnt/kernel
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Create ``/mnt/efi/boot/grub.cfg`` containing the following:
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.. code-block:: console
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set default=0
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set timeout=10
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menuentry "Zephyr Kernel" {
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multiboot /kernel/zephyr.elf
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}
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Unmount the loopback device:
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.. code-block:: none
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$ sudo umount /mnt
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You now have a virtual disk image with a bootable Zephyr in ``zephyr.img``. If the Zephyr build system is not
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the ACRN SOS, then you will need to transfer this image to the ACRN SOS (via, e.g, a USB stick or network )
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#. Follow :ref:`getting-started-apl-nuc` to boot "The ACRN Service OS"
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#. Boot Zephyr as User OS
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On the ACRN SOS, prepare a directory and populate it with Zephyr files.
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.. code-block:: none
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$ mkdir zephyr && cd zephyr
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$ cp /usr/share/acrn/samples/nuc/launch_zephyr.sh .
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$ cp /usr/share/acrn/bios/OVMF.fd .
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You will also need to copy the ``zephyr.img`` created in the above section into directory ``zephyr``.
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Run the ``launch_zephyr.sh`` script to launch Zephyr as UOS.
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.. code-block:: none
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$ sudo ./launch_zephyr.sh
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Then Zephyr will boot up automatically. You will see a console message from the hello_world sample application:
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.. code-block:: console
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Hello World! acrn
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