| .. _ehl_crb: |
| |
| Elkhart Lake CRB |
| ################ |
| |
| Overview |
| ******** |
| Elkhart Lake Reference Board (EHL CRB) is an example implementation of a |
| compact single board computer with high performance for IoT edge devices. |
| |
| This board configuration enables kernel support for the `EHL`_ board. |
| |
| .. note:: |
| This board configuration works on the variant of `EHL`_ |
| boards containing Intel |reg| Atom |trade| SoC. |
| |
| Hardware |
| ******** |
| |
| General information about the board can be found at the `EHL`_ website. |
| |
| .. include:: ../../../../soc/x86/elkhart_lake/doc/supported_features.txt |
| |
| |
| Connections and IOs |
| =================== |
| |
| Refer to the `EHL`_ website for more information. |
| |
| Programming and Debugging |
| ************************* |
| Use the following procedures for booting an image on a EHL CRB board. |
| |
| .. contents:: |
| :depth: 1 |
| :local: |
| :backlinks: top |
| |
| Creating a GRUB2 Boot Loader Image from a Linux Host |
| ==================================================== |
| |
| If you are having problems running an application using the preinstalled |
| copy of GRUB, follow these steps to test on supported boards using a custom GRUB. |
| |
| #. Install the requirements to build GRUB on your host machine. |
| |
| On Ubuntu, type: |
| |
| .. code-block:: console |
| |
| $ sudo apt-get install bison autoconf libopts25-dev flex automake \ |
| pkg-config gettext autopoint |
| |
| On Fedora, type: |
| |
| .. code-block:: console |
| |
| $ sudo dnf install gnu-efi bison m4 autoconf help2man flex \ |
| automake texinfo gettext-devel |
| |
| #. Clone and build the GRUB repository using the script in Zephyr tree, type: |
| |
| .. code-block:: console |
| |
| $ cd $ZEPHYR_BASE |
| $ ./boards/x86/common/scripts/build_grub.sh x86_64 |
| |
| #. Find the binary at |
| :file:`$ZEPHYR_BASE/boards/x86/common/scripts/grub/bin/grub_x86_64.efi`. |
| |
| Build Zephyr application |
| ======================== |
| |
| #. Build a Zephyr application; for instance, to build the ``hello_world`` |
| application on Elkhart Lake CRB: |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/hello_world |
| :board: ehl_crb |
| :goals: build |
| |
| .. note:: |
| |
| A stripped project image file named :file:`zephyr.strip` is automatically |
| created in the build directory after the application is built. This image |
| has removed debug information from the :file:`zephyr.elf` file. |
| |
| Preparing the Boot Device |
| ========================= |
| |
| Prepare a USB flash drive to boot the Zephyr application image on |
| an Elkhart Lake CRB board. |
| |
| #. Format the USB flash drive as FAT32. |
| |
| On Windows, open ``File Explorer``, and right-click on the USB flash drive. |
| Select ``Format...``. Make sure in ``File System``, ``FAT32`` is selected. |
| Click on the ``Format`` button and wait for it to finish. |
| |
| On Linux, graphical utilities such as ``gparted`` can be used to format |
| the USB flash drive as FAT32. Alternatively, under terminal, find out |
| the corresponding device node for the USB flash drive (for example, |
| ``/dev/sdd``). Execute the following command: |
| |
| .. code-block:: console |
| |
| $ mkfs.vfat -F 32 <device-node> |
| |
| .. important:: |
| Make sure the device node is the actual device node for |
| the USB flash drive. Or else you may erase other storage devices |
| on your system, and will render the system unusable afterwards. |
| |
| #. Create the following directories |
| |
| :file:`efi` |
| |
| :file:`efi/boot` |
| |
| :file:`kernel` |
| |
| #. Copy the kernel file :file:`zephyr/zephyr.strip` to the :file:`$USB/kernel` folder. |
| |
| #. Copy your built version of GRUB to :file:`$USB/efi/boot/bootx64.efi` |
| |
| #. Create :file:`$USB/efi/boot/grub.cfg` containing the following: |
| |
| .. code-block:: console |
| |
| set default=0 |
| set timeout=10 |
| |
| menuentry "Zephyr Kernel" { |
| multiboot /kernel/zephyr.strip |
| } |
| |
| Booting the Elkhart Lake CRB Board |
| ================================== |
| |
| Boot the Elkhart Lake CRB board from the boot device using GRUB2 via USB flash drive. |
| |
| #. Insert the prepared boot device (USB flash drive) into the Elkhart Lake CRB board. |
| |
| #. Connect the board to the host system using the serial cable and |
| configure your host system to watch for serial data. See |
| `EHL`_ website for more information. |
| |
| .. note:: |
| On Windows, PuTTY has an option to set up configuration for |
| serial data. Use a baud rate of 115200. |
| |
| #. Power on the Elkhart Lake CRB board. |
| |
| #. When the following output appears, press :kbd:`F7`: |
| |
| .. code-block:: console |
| |
| Press <DEL> or <ESC> to enter setup. |
| |
| #. From the menu that appears, select the menu entry that describes |
| that particular type of USB flash drive. |
| |
| GRUB2 starts and a menu shows entries for the items you added |
| to the file :file:`grub.cfg`. |
| |
| #. Select the image you want to boot and press :guilabel:`Enter`. |
| |
| When the boot process completes, you have finished booting the |
| Zephyr application image. |
| |
| .. note:: |
| You can safely ignore this message if it appears: |
| |
| .. code-block:: console |
| |
| WARNING: no console will be available to OS |
| |
| |
| Booting the Elkhart Lake CRB Board over network |
| =============================================== |
| |
| Build Zephyr image |
| ------------------ |
| |
| #. Follow `Build Zephyr application`_ steps to build Zephyr image. |
| |
| Prepare Linux host |
| ------------------ |
| |
| #. Follow `Creating a GRUB2 Boot Loader Image from a Linux Host`_ steps |
| to create grub binary. |
| |
| #. Install DHCP, TFTP servers. For example ``dnsmasq`` |
| |
| .. code-block:: console |
| |
| $ sudo apt-get install dnsmasq |
| |
| #. Configure DHCP server. Configuration for ``dnsmasq`` is below: |
| |
| .. code-block:: console |
| |
| # Only listen to this interface |
| interface=eno2 |
| dhcp-range=10.1.1.20,10.1.1.30,12h |
| |
| #. Configure TFTP server. |
| |
| .. code-block:: console |
| |
| # tftp |
| enable-tftp |
| tftp-root=/srv/tftp |
| dhcp-boot=grub_x86_64.efi |
| |
| ``grub_x86_64.efi`` is a grub binary created above. |
| |
| #. Create the following directories inside TFTP root :file:`/srv/tftp` |
| |
| .. code-block:: console |
| |
| $ sudo mkdir -p /srv/tftp/EFI/BOOT |
| $ sudo mkdir -p /srv/tftp/kernel |
| |
| #. Copy the Zephyr image :file:`zephyr/zephyr.strip` to the |
| :file:`/srv/tftp/kernel` folder. |
| |
| .. code-block:: console |
| |
| $ sudo cp zephyr/zephyr.strip /srv/tftp/kernel |
| |
| #. Copy your built version of GRUB to :file:`/srv/tftp/grub_x86_64.efi` |
| |
| #. Create :file:`/srv/tftp/EFI/BOOT/grub.cfg` containing the following: |
| |
| .. code-block:: console |
| |
| set default=0 |
| set timeout=10 |
| |
| menuentry "Zephyr Kernel" { |
| multiboot /kernel/zephyr.strip |
| } |
| |
| #. TFTP root should be looking like: |
| |
| .. code-block:: console |
| |
| $ tree /srv/tftp |
| /srv/tftp |
| ├── EFI |
| │ └── BOOT |
| │ └── grub.cfg |
| ├── grub_x86_64.efi |
| └── kernel |
| └── zephyr.strip |
| |
| #. Restart ``dnsmasq`` service: |
| |
| .. code-block:: console |
| |
| $ sudo systemctl restart dnsmasq.service |
| |
| Prepare Elkhart Lake CRB board for network boot |
| ----------------------------------------------- |
| |
| #. Enable PXE network from BIOS settings. |
| |
| .. code-block:: console |
| |
| Advanced -> Network Stack Configuration -> Enable Network Stack -> Enable Ipv4 PXE Support |
| |
| #. Make network boot as the first boot option. |
| |
| .. code-block:: console |
| |
| Boot -> Boot Option #1 : [Network] |
| |
| Booting Elkhart Lake CRB |
| ------------------------ |
| |
| #. Connect the board to the host system using the serial cable and |
| configure your host system to watch for serial data. |
| |
| #. Power on the Elkhart Lake CRB board. |
| |
| #. Verify that the board got an IP address: |
| |
| .. code-block:: console |
| |
| $ journalctl -f -u dnsmasq |
| dnsmasq-dhcp[5386]: DHCPDISCOVER(eno2) 00:07:32:52:25:88 |
| dnsmasq-dhcp[5386]: DHCPOFFER(eno2) 10.1.1.28 00:07:32:52:25:88 |
| dnsmasq-dhcp[5386]: DHCPREQUEST(eno2) 10.1.1.28 00:07:32:52:25:88 |
| dnsmasq-dhcp[5386]: DHCPACK(eno2) 10.1.1.28 00:07:32:52:25:88 |
| |
| #. Verify that network booting is started: |
| |
| .. code-block:: console |
| |
| $ journalctl -f -u dnsmasq |
| dnsmasq-tftp[5386]: sent /srv/tftp/grub_x86_64.efi to 10.1.1.28 |
| dnsmasq-tftp[5386]: sent /srv/tftp/EFI/BOOT/grub.cfg to 10.1.1.28 |
| dnsmasq-tftp[5386]: sent /srv/tftp/kernel/zephyr.strip to 10.1.1.28 |
| |
| #. When the boot process completes, you have finished booting the |
| Zephyr application image. |
| |
| .. _EHL: https://www.intel.com/content/www/us/en/products/docs/processors/embedded/enhanced-for-iot-platform-brief.html |