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I'm running Debian 9 including non-free firmware, in order to get my wifi to work. I do apparently have the necessary firmware as my wifi works, but I do still get the following output after running dmesg:

[ 4.225315] ath10k_pci 0000:03:00.0: firmware: failed to load ath10k/pre-cal-pci-0000:03:00.0.bin (-2) [ 4.225317] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:03:00.0.bin failed with error -2 [ 4.225329] ath10k_pci 0000:03:00.0: firmware: failed to load ath10k/cal-pci-0000:03:00.0.bin (-2) [ 4.225330] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/cal-pci-0000:03:00.0.bin failed with error -2

I can't seem to find the files pre-cal-pci-0000:03:00.0.bin or cal-pci-0000:03:00.0.bin anywhere. As my wifi seems to work flawlessly without them, what is the purpose of these firmware files?

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2 Answers 2

Reset to default
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These are pre-calibration and calibration files; they are optional, and as you’ve noticed, the device can work fine without them. Calibration data can be obtained in a variety of ways (from EEPROM in the device, from files on disk, from device tree information). I get the impression the “firmware” files are intended for very specific configurations (where the PCI location would be fixed); so basically their purpose appears to be to provide a means for systems integrators to provide their own calibration data.

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Unfortunately without these optional pre-calibration files I get very poor 2g performance:

iperf3 -c 192.168.11.1:

Connecting to host 192.168.11.1, port 5201 [ 5] local 192.168.11.177 port 38740 connected to 192.168.11.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 1.54 MBytes 12.9 Mbits/sec 0 65.0 KBytes [ 5] 1.00-2.00 sec 1.10 MBytes 9.24 Mbits/sec 0 72.1 KBytes [ 5] 2.00-3.00 sec 1.16 MBytes 9.75 Mbits/sec 0 74.9 KBytes [ 5] 3.00-4.00 sec 1.33 MBytes 11.1 Mbits/sec 0 83.4 KBytes

lsusb:

03:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)
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    I couldn't find these files either. But more information on pre-calibration files can be found here: usermanual.wiki/Pdf/… Commented Oct 20, 2023 at 7:24

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