[FS#723] ath10k fails station mode for QCA986x/988x

[LEDE Bugs]

The following task has a new comment added:

FS#723 - ath10k fails station mode for QCA986x/988x
User who did this - duc (duc)

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I have a similar problem with version 17.01.4. (BUILD_ID="r3560-79f57e422d")
Hardware: TP-LINK Archer C5 v1 (system type Qualcomm Atheros QCA9558 ver 1 rev 0 with a qca988x chip)

The 5G WLAN has worked correctly with version 15.05, but after the upgrade 5G WLAN station don't work. Even the downgrade don't change anything. 'iw dev' don't show any 5G device.

I have also:
[   10.408822] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/cal-pci-0000:01:00.0.bin failed with error -2
...
[   17.170222] ath10k_pci 0000:01:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/board-2.bin failed with error -2

These files are not present in the /lib/firmware directory tree. I have only ath10k/cal-pci-0000:01:00.0.bin and ath10k/QCA988X/hw2.0/board.bin on the file system.

I don't know if it's normal. 

Is there any way to trace all executed wireless related commands to get the command which don't work?
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=723#comment4683