today I installed Debian 9. Now I have troubles with my WiFi - it doesn't work.
lspci reports "Qualcomm Atheros QCA9377 ... (rev 31)":
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~# lspci | grep -i 9377
02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)
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~# ~# ifconfig
enp1s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.103 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::aa1e:84ff:fe07:aef7 prefixlen 64 scopeid 0x20<link>
ether 11:22:34:56:78:90 txqueuelen 1000 (Ethernet)
RX packets 21930 bytes 21412738 (20.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 17833 bytes 2169298 (2.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Lokale Schleife)
RX packets 4 bytes 240 (240.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4 bytes 240 (240.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
dmesg reports failed to load ath10k/pre-cal-pci-0000:02:00.0.bin and ath10k/cal-pci-0000:02:00.0.bin :
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~# dmesg | grep -i ath
[ 3.712785] ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 4.064807] ath10k_pci 0000:02:00.0: firmware: failed to load ath10k/pre-cal-pci-0000:02:00.0.bin (-2)
[ 4.064860] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:02:00.0.bin failed with error -2
[ 4.064881] ath10k_pci 0000:02:00.0: firmware: failed to load ath10k/cal-pci-0000:02:00.0.bin (-2)
[ 4.064927] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/cal-pci-0000:02:00.0.bin failed with error -2
[ 4.075546] ath10k_pci 0000:02:00.0: firmware: direct-loading firmware ath10k/QCA9377/hw1.0/firmware-5.bin
[ 4.075560] ath10k_pci 0000:02:00.0: qca9377 hw1.1 target 0x05020001 chip_id 0x003821ff sub 11ad:08a6
[ 4.075563] ath10k_pci 0000:02:00.0: kconfig debug 0 debugfs 0 tracing 0 dfs 0 testmode 0
[ 4.076453] ath10k_pci 0000:02:00.0: firmware ver WLAN.TF.1.0-00267-1 api 5 features ignore-otp crc32 79cea2c7
[ 4.143822] ath10k_pci 0000:02:00.0: firmware: direct-loading firmware ath10k/QCA9377/hw1.0/board-2.bin
[ 4.144216] ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 93da0176
[ 5.925170] ath10k_pci 0000:02:00.0: htt-ver 3.1 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[ 5.927466] ath: EEPROM regdomain: 0x69
[ 5.927468] ath: EEPROM indicates we should expect a direct regpair map
[ 5.927471] ath: Country alpha2 being used: 00
[ 5.927472] ath: Regpair used: 0x69
[ 5.937690] ath10k_pci 0000:02:00.0 wlp2s0: renamed from wlan0