66 lines
1.8 KiB
ReStructuredText
66 lines
1.8 KiB
ReStructuredText
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.. _qemu_x86:
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X86 Emulation (QEMU)
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####################
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Overview
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========
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The Zephyr Kernel uses the qemu_x86 board configuration to emulate pentium-class
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systems running on QEMU.
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This board configuration provides support for an x86 Minute IA CPU and the
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following devices:
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* HPET
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* Advanced Programmable 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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The qemu_x86 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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Devices
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-------
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HPET System Clock Support
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~~~~~~~~~~~~~~~~~~~~~~~~~
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The qemu_x86 board configuration uses an HPET clock frequency of 25 MHz.
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Serial Port
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~~~~~~~~~~~
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The qemu_x86 board configuration uses a single serial communication channel that
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uses the NS16550 serial driver operating in polling mode. To override, enable
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the UART_INTERRUPT_DRIVEN Kconfig option, which allows the system to be
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interrupt-driven.
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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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