src/mainboard/emulation/qemu-q35/devicetree.cb

chip mainboard/emulation/qemu-q35
	device cpu_cluster 0 on
		chip cpu/qemu-x86
			device lapic 0 on end
		end
	end
	device domain 0 on
		device pci 0.0 on end		# northbridge (q35)
		chip southbridge/intel/i82801ix
			# present unconditionally
			device pci 1f.0 on end	# LPC
			device pci 1f.2 on end	# SATA
			device pci 1f.3 on end	# SMBus

			# presence depends in qemu config
			# (see docs/q35-chipset.cfg in qemu src tree)
			device pci 1a.0 on end	# UHCI #4
			device pci 1a.1 on end	# UHCI #5
			device pci 1a.2 on end	# UHCI #6
			device pci 1a.7 on end	# EHCI #2
			device pci 1b.0 on end	# HD Audio
			device pci 1c.0 on end	# PCIe Port #1
			device pci 1c.1 on end	# PCIe Port #2
			device pci 1c.2 on end	# PCIe Port #3
			device pci 1c.3 on end	# PCIe Port #4
			device pci 1c.4 on end	# PCIe Port #5
			device pci 1c.5 on end	# PCIe Port #6
			device pci 1d.0 on end	# UHCI #1
			device pci 1d.1 on end	# UHCI #2
			device pci 1d.2 on end	# UHCI #3
			device pci 1d.7 on end	# EHCI #1

			# not present (not emulated by qemu)
			device pci 19.0 off end
			device pci 1f.5 off end
			device pci 1f.6 off end
		end
	end
end