iwlwifi failed to attach

Reply: Bjoern A. Zeeb: "Re: iwlwifi failed to attach"
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From: Oleksandr Kryvulia <shuriku_at_shurik.kiev.ua>
Date: Tue, 29 Mar 2022 12:55:55 UTC

When attaching iwlwifi module according to [1] on CURRENT 
(main-n253905-31e076d70b5-dirty
) I get an error:

Mar 29 15:10:31 thinkpad kernel: iwlwifi0: <iwlwifi> mem 
0xdd638000-0xdd63bfff at device 20.3 on pci0
Mar 29 15:10:31 thinkpad kernel: iwlwifi0: HW_REV=0xFFFFFFFF, PCI issues?
Mar 29 15:10:31 thinkpad kernel: device_attach: iwlwifi0 attach returned 5

This wireless (Intel Wireless-AC 9560) device works fine with iwm:

iwm0@pci0:0:20:3:       class=0x028000 rev=0x30 hdr=0x00 vendor=0x8086 
device=0x9df0 subvendor=0x8086 subdevice=0x0034
     vendor     = 'Intel Corporation'
     device     = 'Cannon Point-LP CNVi [Wireless-AC]'
     class      = network

[1] 
https://wiki.freebsd.org/WiFi/Iwlwifi#I_have_an_iwm.284.29_supported_device