PCIe/PCI rescan for new FPGA devices

[Xianghua Xiao]

I have a FPGA-PCIe device and a FPGA-PCI device that are empty at
kernel boot time, they're only loaded after kernel is up. After I load
FPGA images, "lspci" can not show the device, "echo 1 >
/sys/bus/pci/rescan" also does nothing about it. With a reboot I can
see the devices are allocated correctly though, but I want to avoid
the reboot.

I checked at fakephp(which is to be deprecated) and hotplug/rescan,
none of that worked for this scenario.

Can 'rescan' handle cases like this? or, is there a way that I tell
the kernel to reserve a few BARs somehow in the PCI topology at
bootime so I can "insert" the FPGAs later?

Thanks,
Xianghua
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