.. _getting_started_up2:

Getting started guide for UP2 board
###################################

Hardware setup
**************

The `UP Squared board <http://www.up-board.org/upsquared/>`_ (UP2) is the x86 maker board based on Intel Apollo Lake platform. The UP boards have been used in IoT, industrial automation, digital signage and more. The UP2 features Intel `Celeron N3550 <https://ark.intel.com/products/95598/Intel-Celeron-Processor-N3350-2M-Cache-up-to-2_4-GHz>`_ and Intel `Pentium N4200 <https://ark.intel.com/products/95592/Intel-Pentium-Processor-N4200-2M-Cache-up-to-2_5-GHz>`_ SoCs. Both have been confirmed to work with ACRN.

Connecting to the serial port
=============================

The UP2 board has two serial ports. Please refer to the `UP2 specifications <http://www.up-board.org/upsquared/specifications-up2/>`_ for more information.  We'll access the serial port through the I/O pins in the 40-pin HAT connector using a `USB TTL serial cable <http://www.ftdichip.com/Products/USBTTLSerial.htm>`_. Connect pin 6 (``GND``), pin 8 (``TX``) and pin 10 (``RX``) of the HAT connector to respectively the ``GND``, ``RX`` and ``TX`` pins of your USB serial cable. Plug the USB TTL serial cable into your PC and use a console emulation tool such as ``minicom`` or ``putty`` to communicate with the UP2 board for debugging.

Software setup
**************

Setting up the ACRN hypervisor (and associated components) on the UP2
board is no different than other hardware platforms so please follow
the instructions provided in the :ref:`getting_started`.

There are a few parameters specific to the UP2 board that differ from
what is referenced in the :ref:`getting_started` section:

1. Serial Port settings
#. Storage device name
#. ``pci_devices_ignore`` parameter

You will need to keep these in mind in a few places:

* When mounting the EFI System Partition (ESP)

  .. code-block:: console

     # mount /dev/mmcblk0p1 /mnt

* When adjusting the ``acrn.conf`` file
  
  * Change the ``options`` line and set ``pci_devices_ignore=(0:18:1)``
  * Set the ``root=`` parameter using the ``PARTUUID`` or device name directly

* When configuring the EFI firmware to boot the ACRN hypervisor by default

   .. code-block:: console

      # efibootmgr -c -l "\EFI\acrn\acrn.efi" -d /dev/mmcblk0 -p 1 -L "ACRN Hypervisor" \
          -u "bootloader=\EFI\org.clearlinux\bootloaderx64.efi uart=mmio@0x9141e000"

UP2 serial port setting
=======================

The serial port in the 40-pin HAT connector is located at ``MMIO 0x0x9141e000``.
You can check this from the ``dmesg`` output from the initial Clearlinux installation.

.. code-block:: console

   # dmesg | grep dw-apb-uart
   [2.150689] dw-apb-uart.8: ttyS1 at MMIO 0x91420000 (irq = 4, base_baud = 115200) is a 16550A
   [2.152072] dw-apb-uart.9: ttyS2 at MMIO 0x9141e000 (irq = 5, base_baud = 115200) is a 16550A

The second entry associated with ``dw-apb-uart.9`` is the one on the 40-pin HAT connector.

UP2 block device
================

The UP2 board has an on-board eMMC device. The device name to be used
throughout the :ref:`getting_started` therefore is ``/dev/mmcblk0``
(and ``/dev/mmcblk0pX`` for any partition).

The UUID of the partition ``/dev/mmcblk0p3`` can be found by

.. code-block:: console

   # blkid /dev/mmcblk

.. note::
   You can also use the device name directly, e.g.: ``root=/dev/mmcblk0p3``

Running the hypervisor
**********************

Now that the hypervisor and Service OS have been installed on your UP2 board,
you can proceed with the rest of the instructions in the :ref:`getting_started`
and install the User OS (UOS).