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These chipsets are not natively supported by CentOS.

This page is currently maintained by: Miloš Blažević

Contents

1. Broadcom Corporation BCM4311, BCM4312, BCM4313, BCM4321, BCM4322, BCM43224, BCM43225, BCM43227 and BCM43228 Based Wireless NICs

In order to install Broadcom BCM4311, BCM4312, BCM4313, BCM4321 or BCM4322, BCM43224, BCM43225, BCM43227, or BCM43228 based wireless network cards, the next steps should be followed:

Step 1: Determining WLAN chip and installing dependencies

First of all, make sure you are the 'proud owner of Broadcom BCM43xx wireless card':

After the WLAN chip model was determined, make sure you have no missing packages needed at compile-time and install them if you do:

Of course, if you're compiling the driver for Xen kernel (i.e. kernel-xen), you should install kernel-xen-devel instead of kernel-devel.

Step 2: Downloading and extracting Broadcom driver archive

Download the Broadcom BCM43xx linux driver archive from Broadcom Official website - you'll find it as in the search results list as either Linux® STA 32-bit driver or Linux® STA 64-bit driver - to your machine and extract it to /usr/local/src/hybrid-wl and feel free to change the ownership of the directory and it's contents to some unprivileged user

Step 3a: Compiling the Broadcom driver module (on EL6 and EL7)

Driver module can be compiled as follows:

Mind the quotes (i.e. back quotes).

Now, with the current driver (version 6.30.223.271) it's almost certain you'll get an error message instead of compiled driver module (in fact, different scenario other that this error message is unknown to the author). The message might/will vary depending on the kernel and OS version, but on CentOS 6 it should look something like this:

On EL6, the driver won't compile because of the if-then-else clause for kernel version checking in file wl_cfg80211_hybrid.c. To remedy this, we'll run the following sed replacement commands:

Just these 'sed' replacements are not enough to ensure proper driver compilation. So, we also need to apply the following patch wl-kmod-fix-ioctl-handling.patch prior to actually compiling the driver. Download it to /usr/local/src and run the following command to patch the driver source code:

Now, try compiling the driver module again:

and the compile output should look something like this:

{{{make: Entering directory `/usr/src/kernels/2.6.32-573.7.1.el6.x86_64' CFG80211 API is prefered for this kernel version Using CFG80211 API

• LD /usr/local/src/hybrid-wl/built-in.o CC [M] /usr/local/src/hybrid-wl/src/shared/linux_osl.o CC [M] /usr/local/src/hybrid-wl/src/wl/sys/wl_linux.o CC [M] /usr/local/src/hybrid-wl/src/wl/sys/wl_iw.o CC [M] /usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.o

/usr/local/src/hybrid-wl/src/wl/sys/wl_cfg80211_hybrid.c:1802: warning: initialization from incompatible pointer type

• LD [M] /usr/local/src/hybrid-wl/wl.o Building modules, stage 2.

CFG80211 API is prefered for this kernel version Using CFG80211 API

• MODPOST 1 modules CC /usr/local/src/hybrid-wl/wl.mod.o LD [M] /usr/local/src/hybrid-wl/wl.ko.unsigned NO SIGN [M] /usr/local/src/hybrid-wl/wl.ko

make: Leaving directory `/usr/src/kernels/2.6.32-573.7.1.el6.x86_64' }}} The module, once built, can be stripped of unnecessary symbols:

What you will notice, is that driver module file size reduces (from 8.2MB to 7.2MB). And yes, your driver module works

Step 3b: Compiling the Broadcom driver module (specifics required for EL7)

Depending on EL7 point release (or better yet, the kernel version you're running), sub-set of sed replacements to apply will differ. So, stock kernels shipped with EL 7.0 (i.e. kernel-3.10.0-123.X), don't require running any of the commands below, EL 7.1 (i.e. kernel-3.10.0-229.X) require the first two, EL 7.2 (i.e. kernel-3.10.0-327.X), require first four 'sed' commands, EL 7.3 requires first 6 executed, EL7.4 first 7, and for EL 7.5 all 'sed' commands are required so as to make the code compile (along with the one from step 3a):

Again, esp. if you're running EL 7.3, or one of its kernels, you'll have to apply the following patches wl-kmod-01_kernel_4.7_IEEE80211_BAND_to_NL80211_BAND.patchwl-kmod-02_kernel_4.8_add_cfg80211_scan_info_struct.patchwl-kmod-03_fix_kernel_warnings.patchwl-kmod-04_kernel_4.11_remove_last_rx_in_net_device_struct.patchwl-kmod-05_kernel_4.12_add_cfg80211_roam_info_struct.patchBEFORE you apply the above sed replacement commands (otherwise, compilation won't work). Also, don't forget the patch from step 3a:

After applying these to the source code, just follow through the reminder of step 3a - compile the driver, and strip debugging info from it. Again, kernel builds =>229 require first two commands ONLY, builds => 327 require running first four sed replacements, builds >=514 require 6, builds >=693 require 7, and for builds >=862 all sed replacements are needed for driver to compile

Step 4a: Loading the driver module into kernel

Having successfully compiled the driver module, you can now load it into kernel, and eventually set up automatic driver load on system boot (to do all this, you'll have to assume root privileges). Of course, driver module loading can be done only after you remove the existing/conflicting wireless driver modules from kernel (in case these are loaded):

copy the driver module file to a location where kernel can find it:

to be consistent with all other external modules that have been / may be installed from a kmod packages (e.g. fuse, ntfs-3g, etc.)

Next, run:

in order to create a list of module dependencies, and now load the driver module:

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If no error was reported, the driver module is now successfully loaded and ready to use. The 'ndiswrapper' kernel module can be removed, provided you don't use it for anything else but wireless driver - but this is not necessary.

Step 4b: Loading the driver module into kernel on boot time

Couple of more steps are needed to get your module load every time the system boots. First, edit the /etc/modprobe.d/blacklist.conf file adding the lines:

By doing so, you're preventing these modules from being loaded into kernel at boot time and conflicting with the wl module. Second, in order to load the wl module into the kernel on boot time, create/edit the file /etc/sysconfig/modules/kmod-wl.modules and copy-paste the following contents into it:

Your driver should now load every time you reboot (except of course, when you install the new kernel, in which case the driver has to be re-compiled for it following these same steps).

Appendix A: Broadcom chip models tested and reported (by community members) as working

Appendix B: Broadcom chip intermittent problems

This driver module, in author's experience, is sometimes known to require multiple reboots to make the WiFi work. In layman's terms, the WiFi card, finds the AP(s), but fails to associate it with the driver. I've made numerous attempts to make the card/driver work without a reboot, to no avail. Starting/stopping wpa_supplicant service, turning WiFi on/off, (un)loading the driver, ...etc. Sometimes it would only start working after several reboots.

From /var/log/wpa_supplicant.log:

and in /var/log/messages:

Rumour has it, this is caused by 'improper' loading of the WiFi card firmware on boot, hence, only rebooting the system fixes it.

Another problem (probably caused by improperly loaded firmware) is choppy/flaky network connectivity. The cards appears to have associated to the AP, but shows poor signal quality even though you're in the same room with the AP. even pings are dropping, and bottom line - connection is useless. Again, this should be resolved by repeated reboots until the firmware is loaded properly.

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