| .. _qemu_x86: |
| |
| X86 Emulation (QEMU) |
| #################### |
| |
| Overview |
| ******** |
| |
| The Zephyr Kernel uses the qemu_x86 board configuration to emulate pentium-class |
| systems running on QEMU. |
| This board configuration provides support for an x86 Minute IA CPU and the |
| following devices: |
| |
| * HPET |
| * Advanced Programmable Interrupt Controller (APIC) |
| * NS16550 UART |
| |
| |
| Hardware |
| ******** |
| |
| Supported Features |
| ================== |
| |
| The qemu_x86 board configuration supports the following hardware features: |
| |
| +--------------+------------+-----------------------+ |
| | Interface | Controller | Driver/Component | |
| +==============+============+=======================+ |
| | HPET | on-chip | system clock | |
| +--------------+------------+-----------------------+ |
| | APIC | on-chip | interrupt controller | |
| +--------------+------------+-----------------------+ |
| | NS16550 | on-chip | serial port | |
| | UART | | | |
| +--------------+------------+-----------------------+ |
| |
| Devices |
| ======= |
| |
| HPET System Clock Support |
| ------------------------- |
| |
| The qemu_x86 board configuration uses an HPET clock frequency of 25 MHz. |
| |
| Serial Port |
| ----------- |
| |
| The qemu_x86 board configuration uses a single serial communication channel that |
| uses the NS16550 serial driver operating in polling mode. To override, enable |
| the UART_INTERRUPT_DRIVEN Kconfig option, which allows the system to be |
| interrupt-driven. |
| |
| Known Problems or Limitations |
| ============================= |
| |
| The following platform features are unsupported: |
| |
| * Isolated Memory Regions |
| * Serial port in Direct Memory Access (DMA) mode |
| * Serial Peripheral Interface (SPI) flash |
| * General-Purpose Input/Output (GPIO) |
| * Inter-Integrated Circuit (I2C) |
| * Ethernet |
| * Supervisor Mode Execution Protection (SMEP) |
