On Thu, May 25, 2017 at 10:20:10AM +0300, mika.westerb...@linux.intel.com wrote: > On Wed, May 24, 2017 at 07:32:45PM +0000, Jamet, Michael wrote: > > I talked to our BIOS expert today. Here is his advice to debugging further: > > > > It looks like something may have been wrong from system (BIOS, FW, > > others...) perspective. > > On reboot need to enter EFI shell and check resources of > > pci 0000:01:00.0: bridge. > > At the EFI shell, this bridge MUST be either configured or absent. > > > > I would start this way, once we have this info, we may circle back to > > him and look into next debugging step. > > Thanks, I'll try this today.
This is the contents dumped directly from EFI shell when a device is connected. It seems that the vendor_id/device_id is 0xffff but the rest of the config seems to be present (although not fully configured): PCI Segment 00 Bus 01 Device 00 Func 00 [EFI 0001000000] 00000000: FF FF FF FF 00 00 10 00-00 00 04 06 00 00 01 00 *................* 00000010: 00 00 00 00 00 00 00 00-00 00 00 00 01 01 00 00 *................* 00000020: 00 00 00 00 01 00 01 00-00 00 00 00 00 00 00 00 *................* 00000030: 00 00 00 00 80 00 00 00-00 00 00 00 FF 01 00 00 *................* 00000040: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 00000050: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 00000060: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 00000070: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 00000080: 01 88 C3 FF 08 00 00 00-05 AC 80 00 00 00 00 00 *................* 00000090: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 000000A0: 00 00 00 00 00 00 00 00-00 00 00 00 0D C0 00 00 *................* 000000B0: 22 22 11 11 00 00 00 00-00 00 00 00 00 00 00 00 *""..............* 000000C0: 10 00 52 00 20 80 E8 07-10 28 10 00 43 5C 45 00 *..R. ....(..C\E.* 000000D0: 00 00 23 10 00 00 00 00-00 00 00 00 00 00 00 00 *..#.............* 000000E0: 00 00 00 00 00 08 00 00-00 00 00 00 0E 00 00 00 *................* 000000F0: 03 00 1E 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* I wonder how Linux manages to find the device if vendor_id/device_id reads 0xffff?
