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