Raspberry Pi 3B+ on board wifi fails to start.

alpinepi:/# iwlist wlan0 scan
wlan0 Interface doesn’t support scanning : Interrupted system call

alpinepi:/# rfkill list
0: phy0: wlan
Soft blocked: no
Hard blocked: no

Some misc internet posts suggest that you have to set the regulatory domain before the interface will come up. Tried to set many ways including wpa_supplicant, iw, and setting a modprobe.d config.
alpinepi:/# cat /etc/modprobe.d/cfg80211.conf
options cfg80211 ieee80211_regdom=US

At this point i believe its either firmware or possibly a udev issue.

(from redmine: issue id 9549, created on 2018-10-10, closed on 2019-05-09)

• Changesets:
  • Revision 879ccecb by Timo Teräs on 2019-02-15T09:22:39Z:

community/wireless-regdb: include the new format firmware file

ref #9549

• Revision 64c5d784 by Timo Teräs on 2019-02-15T12:18:24Z:

main/alpine-conf: include wifi regulatory db in modloop

ref #9549

• Revision e48587de by Timo Teräs on 2019-02-15T12:42:34Z:

scripts/mkimg.base.sh: include wifi regulatory database in modloop

ref #9549

• Revision 9d2189d2 by Timo Teräs on 2019-02-22T12:02:12Z:

main/alpine-conf: include wifi regulatory db in modloop

ref #9549

(cherry picked from commit 64c5d7842ff796ab257b1cdef4f996bf04990c97)

• Revision 166a2ebb by Timo Teräs on 2019-02-22T12:03:10Z:

community/wireless-regdb: include the new format firmware file

ref #9549

(cherry picked from commit 879ccecb8bae7421243903595a65f25ffb88e69e)

• Revision 6d5a5abc by Timo Teräs on 2019-02-28T21:09:54Z:

scripts/mkimg.base.sh: include wifi regulatory database in modloop

ref #9549

(cherry picked from commit e48587de6695462214576089efe77370478700aa)

• Revision 0a01a287 by Timo Teräs on 2019-03-22T19:26:15Z:

main/linux-firmware: upgrade to 20190322, update rpi firmwares

* update rpi wifi firmware, use better source
* update rpi bluetooth firmware
* purge additional source code files

ref #9549

• Revision 96bda76b by Timo Teräs on 2019-03-22T19:26:15Z:

main/alpine-conf: include associated firmware files to modloop

ref #9549

• Revision 51102941 by Timo Teräs on 2019-04-11T11:03:20Z:

main/linux-firmware: upgrade to 20190322, update rpi firmwares

* update rpi wifi firmware, use better source
* update rpi bluetooth firmware
* purge additional source code files

ref #9549

(cherry picked from commit 0a01a2870e96c61b8bf6ecb2d98f4acb629c36d8)

• Revision 13a39a8f by Timo Teräs on 2019-04-11T11:03:32Z:

main/alpine-conf: include associated firmware files to modloop

ref #9549

(cherry picked from commit 96bda76be60e16d17e26feb82e7686a865b6695c)

• Revision c786cb5c3cc3c9b1dcfd3ccda7f61abe81ae07da by Timo Teräs on 2019-06-14T12:20:46Z:

update-kernel: include associated firmware files to modloop

Some drivers reference only the .bin but require additional
files such as .$board.txt or .clm_blob. Include all files
in modloop that might match. ref #9549