>>> After I plug my board in,  I executed  echo 1>  /sys/bus/pci/rescan
>>
>>
>
> Can you try echo 1 > /sys/bus/pci/slots/XXX/power?
> (XXX: slot number)
Hallo Kenji,

     I am still having the same problem after executing "echo 1 > 
/sys/bus/pci/slots/0000\:02\:00.0/power"

>
>> It seems like a pciehp bug that you have to rescan explicitly.  But
>> I'm not a pciehp expert and I haven't looked at the code.
>
> The pciehp automatically scans the bus on presence changed event
> (e.g. board is pluged in) if the hot-plug controller supports
> surprise removal. Otherwise, you need to power on slot explicitly
> by "echo 1 > /sys/bus/pci/slots/XXX/power". So one possibility is
> that your controller doesn't support surprise removal. We can
> check it by looking at the pciehp's debug output. Can you send
> whole dmesg output?

I attached to you the whole dmesg log.

Cheers,
Ghani