I have this same problem. 5ghz as working just fine until I foolishly decided to upgrade my trunk build from ~2.5 weeks or so ago. Now I am getting the same error as you. I'm in the process of building 40698 from source at the moment. I've learned my lesson: if it's not broken then don't try to fix it, especially when it comes to this firmware
Edit: Successfully built r40698 and included a number of packages (including kmod-ath10k) that are not normally included in the snapshot. It was my first time doing this and it was a very pleasant process. kmod-ath10k works once again for me, using r40698. I think from now on in the future I'm going to build my own. I chose r40698 because in the bug report, a user stated that the wireless driver worked properly for him with that build but it's possible that there could be even later ones where it still works.
I got an archer c7 v2 yesterday and flashed barrier breaker onto it. The ath10k-pci module from the kmod-ath10k package doesn't seem to work with it. The package itself is dated from 2014-05-19 and it is on BB r40804.
dmesg gives me:
root@OpenWrt:/# dmesg | grep ath10k [ 210.560000] ath10k_pci 0000:01:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit] [ 210.870000] ath10k: pci irq legacy irq_mode 0 reset_mode 0 [ 210.960000] ath10k: otp calibration failed: 2 [ 210.960000] ath10k: failed to run otp: -22 [ 210.970000] ath10k: could not init core (-22) [ 211.230000] ath10k: could not probe fw (-22) [ 211.230000] ath10k: failed to register driver core: -22 [ 211.230000] ath10k_pci: probe of 0000:01:00.0 failed with error -22
I also found this bug report as well, which seems to be what I am experiencing.
Has anyone else run into this issue? I was thinking that maybe I should clone the git sources and build from about a week ago or so. From all that I have read, the v2 should work with the 5GHz band of this router...
(Last edited by pbpeod on 3 Jun 2014, 03:08)