[ubuntu] recompile sierra 3G modem driver sierra.ko with custom wireless-regdb
in my ubuntu laptop I have both a WiFi-card and a sierra 3G (UMTS) modem built in.
Because the wifi card is imported and I need to use certain channels not allowed in the card's country of origin to connect to the local university network I installed a custom, self-signed wireless-regdb.
This works great for the WiFi card, but unfortunately whenever I load the custom wireless-regdb, my sierra 3G modem card goes offline and is not detected any more by network manager.
My suspicion is that the UMTS-Modem's driver does not recognize the custom regdb's signature as valid and therefore shuts down. (The behaviour is much the same with stock crda for wifi cards).
With crda there is an option to include custom public keys in the source code and recompile, so the system will from then on recognize frequency databases signed with this custom key as valid and use them.
Does anyone know of a similare procedure for the sierra 3G modem driver kernel module (sierra.ko)?
crda is listed as a dependency for that module, so I am confident to be on the right track, but unfortunately I have until now found zero documentation on the subject.
Can anyone help please?