Michael Kisel schrieb:

Regardless whether or not a device is being handled by a resource manager/driver, pci_device_find() will locate all enumerated devices.

Yes, it should locate all enumerated devices. But it doesn't in our case ! That's simply a matter
of facts.

see
When the system first starts, before you start any resource manager on you device, do both instances of the device show up in the pci-tool output?

Again ... the identical resource managers of two identical boards are started out of a very late position within a boot image.

If they do, then pci_device_find() will also find them given the correct parameters bec pci-tool uses the pci_device_find() API.
If you have 2 instances of a device, the instance of interest is specified with the first parameter to pci_device_find(). Keep in mind however that this is based on the search criteria. It may be that the wrong 'idx' parameter is being passed to pci_device_find().

We do it since more than 25 years in a correct way and understanding!

Please see also the 'use' information in pci-tool that describes this. If none of this solves the problem, please provide additional information (slog2info, pci_tool -tvv output, etc)

The behavior of pci_device_find seems to work unpredictable in our configuration.
Are there any timing problem within the pci_server?

Armin