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The wireless-regdb would provide the kernel with the regulatory database but it has several disadvantages. For eg; every update to the db.txt file that you would be using to update the regulatory specifications, you would have to recompile the kernel. When using bcmdhd or brcmfmac driver , the regdb values are ignored and only CLM blob values are considered by utilities like iw, wpa_supplicant etc.
Was you kernel built with the following flag CONFIG_CFG80211_INTERNAL_REGDB.
We are working with ublox.
Thx for clarification.
Yes, we are building with CONFIG_CFG80211_INTERNAL_REGDB=y