2017-04-25 07:14:33 +08:00
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.. _minnowboard_board:
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MinnowBoard Max
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###############
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Overview
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********
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The `MinnowBoard`_ board configuration supports the following:
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* HPET
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* Advanced Programmed Interrupt Controller (APIC)
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* NS16550 UART
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Hardware
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********
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Supported Features
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==================
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This board configuration supports the following hardware features:
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+--------------+------------+-----------------------+
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| Interface | Controller | Driver/Component |
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+==============+============+=======================+
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| HPET | on-chip | system clock |
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+--------------+------------+-----------------------+
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| APIC | on-chip | interrupt controller |
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+--------------+------------+-----------------------+
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| NS16550 | on-chip | serial port |
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| UART | | |
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+--------------+------------+-----------------------+
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The kernel currently does not support other hardware features on this platform.
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HPET System Clock Support
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--------------------------
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This board uses a system clock frequency of 25 MHz.
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.. note::
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The LOAPIC timer may be used instead of the HPET. To do so,
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set SYS_CLOCK_HW_CYCLES_PER_SEC to a custom value that is tied to the host system speed.
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Serial Port
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-----------
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This board uses a single serial communication channel
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with a NS16550 serial driver that operates in polling mode.
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2018-02-08 03:12:30 +08:00
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For an interrupt-driven driver, enable the
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:option:`CONFIG_UART_INTERRUPT_DRIVEN` kernel configuration option.
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2017-04-25 07:14:33 +08:00
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2018-01-31 23:33:04 +08:00
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PCI
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----
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PCI drivers assume that IO regions and IRQs for devices are preconfigured
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identically by the firmware on all supported devices. This configuration is
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specified in the Kconfig file for the Intel Atom SoC. The PCI library supports
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dynamically enumerating PCI devices, but that support is disabled by default.
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.. note::
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The PCI library does not support 64-bit devices.
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Memory address and size storage only require 32-bit integers.
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2017-04-25 07:14:33 +08:00
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Known Problems or Limitations
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-----------------------------
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The following platform features are unsupported:
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* Isolated Memory Regions
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* Serial port in Direct Memory Access (DMA) mode
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* Serial Peripheral Interface (SPI) flash
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* General-Purpose Input/Output (GPIO)
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* Inter-Integrated Circuit (I2C)
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* Ethernet
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* Supervisor Mode Execution Protection (SMEP)
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2018-01-31 23:33:04 +08:00
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Creating a GRUB2 Boot Loader Image from a Linux Host
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====================================================
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Follow the same steps documented for the :ref:`Galileo board <grub2>`.
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2018-02-08 03:12:30 +08:00
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Booting Zephyr on the MinnowBoard
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2018-01-31 23:33:04 +08:00
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=================================
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The MinnowBoard by default will be running a 64bit firmware. To boot Zephyr, you
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will need to replace the 64bit firmware with the 32bit variant. Please follow
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the instructions for flashing and updating the firmware documented at the
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`MinnowBoard firmware`_ website.
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2017-04-25 07:14:33 +08:00
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.. _MinnowBoard: https://minnowboard.org/
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2018-01-31 23:33:04 +08:00
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.. _MinnowBoard firmware: https://minnowboard.org/tutorials/updating-the-firmware
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