[yocto] How to add WiFi support

[Sean Liming]

> -----Original Message-----
> From: yocto-bounces at yoctoproject.org [mailto:yocto-
> bounces at yoctoproject.org] On Behalf Of Sean Liming
> Sent: Wednesday, July 03, 2013 4:37 PM
> To: yocto at yoctoproject.org
> Subject: [yocto] How to add WiFi support
> 
> I have searched and spotted different discussion on adding wireless
support
> but have not found a solution. I have a Intel Centrino Wireless-N 1000
card
> plugged into a Intel Atom N2800 (Cedar Trail) platform. I am using Yocto
> Project 1.3.1, Cedar Trail BSP, core-image-x11
> 
> BB_VERSION        = "1.16.0"
> TARGET_ARCH       = "i586"
> TARGET_OS         = "linux"
> MACHINE           = "cedartrail-nopvr"
> DISTRO            = "poky"
> DISTRO_VERSION    = "1.3.1"
> TUNE_FEATURES     = "m32 core2"
> Core-image-x11
> 
> Following the instructions to use menuconfig and create configuration
> fragment, I have enabled the various kernel options to include the iwlagn
> driver. The configuration fragment called mydiff.cfg (attached) was placed
in
> the meta-intel/meta-cedartrail/recipes-kernel/Linux/files folder. The
Linux-
> yocto_3.0.bbappend was modified with the following:
> 
> FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
> SRC_URI += "file://mydiff.cfg"
> 
> After building the image, ifconfig didn't show wireless and neither does
> iwconfig. The adapter is found when I do a lspci. The kernel wireless
website
> - http://wireless.kernel.org/en/users/Drivers/iwlwifi  lists a firmware
> package needed for installation. I tried to create a recipe to place the
> firmware file in the /lib/firmware folder, but it doesn't get put in. The
lack of
> what to do for the LICENSE might be a problem. Here is the
> recipe:
> 
> DESCRIPTION = "Intel WiFi 1000 Adapter"
> LICENSE = "GPL"-?????
> LIC_FILES_CHKSUM =
> "file://${WORKDIR}/LICENSE.iwlwifi-1000-
> ucode;md5=aa2bfb02c7e0712680334b9f47
> f8dc61"
> 
> SRC_URI = "file://LICENSE.iwlwifi-1000-ucode \
> 	   file://iwlwifi-1000-3.ucode \
> 	   "
> FWPATH = "lib/firmware"
> do_install_apped() {
> 	install -m 0644 LICENSE.iwlwifi-1000-ucode ${D}${FWPATH}
> 	install -m 0644 iwlwifi-1000-3.ucode ${D}${FWPATH} }
> 
> I manually created the /lib/firmware folder and copied the firmware file
> (iwlwifi-1000-3.ucode) to the folder. Nothing changed after a reboot. I
also
> tried a Intel Centrino Ultimate-N 6300 same result.
> 
> 1. Was a kernel modification the right direction to enable support for
this
> driver?
> 2. Did I miss anything with regards to the configuration fragment setup?
> 3. Is the firmware really needed? If so why is there no /lib/firmware
folder
> and what should be used for the LICENSE ?
> 
> 
> Regards,
> 
> Sean Liming

Update: After checking the /proc/config.gz, I noticed that the custom kernel
settings are not being set. Is there specific location for the configuration
fragment to be placed? I put it in the BSP's recipes-kernel/Linux/files
folder.

After installing Ubuntu on the target, iwlwifi is being used rather than
iwlagn. I have a updated my custom config.

Regards,

Sean Liming