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QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
QNX Hypervisor for Safety Virtual Device Developer's API Reference
firmware.h
Functions for working with the firmware components of the VM presented to the guest
gfdt_update_property()
Set a property value (ARM)

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics tool suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running QNX Neutrino 7.1.
QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
- QNX Hypervisor for Safety User's Guide
- QNX Hypervisor for Safety Virtual Device Developer's Guide
- QNX Hypervisor for Safety Virtual Device Developer's API Reference
  - Function Safety
    This section provides an overview of the restrictions that may apply when using the functions in this API.
  - aarch64/vmid.h
    Definitions to access a guest's VMID (ARM)
  - abi.h
    Application binary interface (ABI) version of the vdev API
  - cdev.h
    Functions to create virtual character devices for guests
  - firmware.h
    Functions for working with the firmware components of the VM presented to the guest
    - gacpi_add_table()
      Format and add an ACPI table to the guest (x86)
    - gacpi_register_ioapic()
      Add an IO-APIC vdev to the MADT (x86)
    - gfdt_add_vdev()
      Add a vdev node to the FDT (ARM)
    - gfdt_get_clock()
      Generate a clock node in the FDT (ARM)
    - gfdt_get_phandle()
      Get the phandle for a virtual device (vdev)
    - gfdt_intr_spec()
      Get the FDT data that represents an interrupt (ARM)
    - gfdt_update_interrupts()
      Generate an interrupt property (ARM)
    - gfdt_update_node()
      Create an FDT node (ARM)
    - gfdt_update_phandle()
      Add a phandle property to a node, unless it's already present (ARM)
    - gfdt_update_prop_cells()
      Set a property value of uint32_t cells (ARM)
    - gfdt_update_prop_string()
      Set a property to a string value (ARM)
    - gfdt_update_prop_strings()
      Set a property to a list of string values (ARM)
    - gfdt_update_property()
      Set a property value (ARM)
    - gfdt_update_reg()
      Generate a reg property (ARM)
  - gasp.h
    Functions for working in guest address spaces
  - guest.h
    Definitions for manipulating a guest system
  - hpci.h
    Host PCI interface for vdevs
  - hw_pci.h
    PCI support for vdevs
  - outpipe.h
    Definitions for the output pipe (outpipe)
  - types.h
    vdev API base types
  - utils.h
    Miscellaneous utility functions
  - vdev.h
    Source compatibility header file
  - vdev-core.h
    Definitions for vdevs
  - vio.h
    Definitions for VIRTIO vdevs
  - vpci.h
    Definitions for virtual PCI devices
  - wdog.h
    Definitions to support virtual watchdog devices
  - x86_64/apic.h
    Definitions for the virtual APIC bus (x86)
- QNX Hypervisor User's Guide
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

gfdt_update_property()

Set a property value (ARM)

Synopsis:

#include <qvm/firmware.h>

void gfdt_update_property(int node,
                          const char *propname,
                          const void *valp,
                          size_t vall)

Arguments:

node: The offset of the FDT node where the property is being set.
propname: A pointer to the name of the property being set.
valp: A pointer to the new property value.
vall: The length of the property value, in bytes.

Description:

If the property isn't already present, this function sets the given property in the given FDT node to the given value.

Page updated: March 12, 2026