Intel AC 7260 dual band WiFi support in 12.3

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From: jin guojun <jguojun_at_gmail.com>
Date: Thu, 21 Jul 2022 18:24:12 UTC

I saw some discussion about this WiFi chip not working under FreeBSD but
there seems no conclusion as to why it does not work for certain cases.

I am trying to configure iwm in FreeBSD 12.3-Release on a Dell E5540
laptop. Here is some system information:

#dmesg | grep iwm
iwm0: <Intel(R) Dual Band Wireless AC 7260> mem 0xf7a00000-0xf7a01fff irq
19 at device 0.0 on pci2
iwm0: hw rev 0x140, fw ver 17.352738.0, address ac:7b:a1:34:fa:85

#ifconfig iwm0 up
ifconfig: interface iwm0 does not exist

This laptop WiFi works with Ubuntu 18.04, so this AC7260 is a working card.
Does anyone know if AC 7260 card can be made to work under FreeBSD 12.3?
Anything can we try to see what could be wrong to bring iwm0 up?

TIA,
-Jin

PS: in 12.x release hardware notes, there are typos for AC 7260 driver
(iwn):
  [i386, amd64] Intel Dual Band Wireless AC 3160/7260/7265 IEEE 802.11ac
network adapters (iwn(4) driver).
13.1-Release has fixed this typo to iwm(4).