[yocto] adding drivers to the kernel

[Marc Ferland]

Jim Abernathy <jfabernathy at gmail.com> writes:

> If I need to add a driver for a networking device that should be in
> the 3.0 kernel, but seems to be turned off, I usually follow the
> example in sections B.2.3 in the Development Manual. When I get to the
> stage of running bitbake linux-yocto -c menuconfig, I can search for
> my device with the "/" command and search for CONFIG_RTL8192CE and I
> find this:
>
> Symbol: RTL8192CE [=n] │
> │ Type : tristate │
> │ Prompt: Realtek RTL8192CE/RTL8188CE Wireless Network Adapter │
> │ Defined at drivers/net/wireless/rtlwifi/Kconfig:1 │
> │ Depends on: NETDEVICES [=y] && WLAN [=y] && MAC80211 [=n] && PCI [=y] │
> │ Location: │
> │ -> Device Drivers │
> │ -> Network device support (NETDEVICES [=y]) │
> │ -> Wireless LAN (WLAN [=y]) │
> │ Selects: FW_LOADER [=y] && RTLWIFI [=n] && RTL8192C_COMMON [=n]
>
> However, I can't find this device where is should be or anywhere in
> the .config file. I've tried just adding the CONFIG_RTL8192CE=y to a
> config fragment file anyway and that didn't work. After building the
> image, the .config still didn't have the CONFIG_RTL8192CE=y. The 3.0
> kernel should have support for the RTL8192CE devices.
>
> Also if I manual add CONFIG_RTL8192CE=y to the .config file and then
> compile and build the kernel, the RTL8192CE parameter is removed from
> the .config file after the kernel build.
>
You probably need to enable MAC80211 first. Your RTL8192CE driver will
be selectable afterwards.
Marc