70 lines
1.8 KiB
ReStructuredText
70 lines
1.8 KiB
ReStructuredText
.. _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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For an interrupt-driven driver, enable the UART_INTERRUPT_DRIVEN kernel configuration option.
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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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.. _MinnowBoard: https://minnowboard.org/
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