99 lines
2.7 KiB
ReStructuredText
99 lines
2.7 KiB
ReStructuredText
.. _qemu_arc:
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ARC EM & HS Emulation (QEMU)
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###############################
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Overview
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********
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This board configuration will use QEMU to emulate a generic ARC EM &
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ARC HS hardware platform.
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The following features of ARCv2 ISA cores are currently supported:
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* ARC EM or ARC HS core (both belong to ARCv2 ISA family still
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they are binary incompatible)
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* Only little-endian configurations
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* Full 32 register set
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* ARC core free-running timers/counters Timer0 & Timer1
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* ARC core interrupt controller with multiple priority levels
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* DW UART
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* 5 slots for MMIO Virtio devices
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Hardware
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********
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Supported Features
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==================
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The following hardware features are supported:
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+--------------+------------+----------------------+
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| Interface | Controller | Driver/Component |
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+==============+============+======================+
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| ARCv2 INTC | on-chip | interrupt controller |
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+--------------+------------+----------------------+
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| DW UART | on-chip | serial port |
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+--------------+------------+----------------------+
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| ARC TIMER0 | on-chip | system clock |
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+--------------+------------+----------------------+
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The kernel currently does not support other hardware features on this platform.
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Devices
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========
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System Clock
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------------
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This board configuration uses a system clock frequency of 1 MHz.
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Serial Port
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-----------
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This board configuration uses a single serial communication channel with the
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DesignWare UART.
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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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* Memory-protection unit (MPU)
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* MMIO Virtio Ethernet
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Programming and Debugging
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*************************
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Use this configuration to run basic Zephyr applications and kernel tests in the QEMU
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emulated environment, for example, with the :ref:`synchronization_sample`
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(note you may use ``qemu_arc_em`` or ``qemu_arc_hs`` depending on target CPU):
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.. zephyr-app-commands::
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:zephyr-app: samples/synchronization
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:host-os: unix
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:board: qemu_arc_em
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:goals: run
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This will build an image with the synchronization sample app, boot it using
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QEMU, and display the following console output:
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.. code-block:: console
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*** Booting Zephyr OS build zephyr-v2.2.0-2486-g7dbfcf4bab57 ***
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threadA: Hello World from qemu_arc!
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threadB: Hello World from qemu_arc!
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threadA: Hello World from qemu_arc!
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threadB: Hello World from qemu_arc!
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Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.
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Debugging
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=========
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Refer to the detailed overview about :ref:`application_debugging`.
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References
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**********
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1.`Programmer’s Reference Manual for ARC HS
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<https://www.synopsys.com/dw/doc.php/ds/cc/programmers-reference-manual-ARC-HS.pdf>`_
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