问题
在我的macbookpro8.1上，使用ubuntu16上的b43驱动成功实现连接wifi信号，但是编译新的linux4.15内核并在内核配置里边加了bcm4331的驱动，还是出现问题，只有wifi标识，没有wifi信号（似乎就是不能搜索wifi）。
ubuntu16自带的内核
说明
使用安装ubuntu16.04自己的内核4.10，可正常上网，但是编译新版本内核4.15，无法上网。开机后使用dmesg查看–好使的情况
[ 21.833056] b43-phy0: Broadcom 4331 WLAN found (core revision 29)
[ 21.833460] b43-phy0: Found PHY: Analog 9,Type 7 (HT),Revision 1
[ 21.833470] b43-phy0: Found Radio: Manuf 0x17F,ID 0x2059,Revision 0,Version 1
[ 21.833470] b43-phy0 warning: 5 GHz band is unsupported on this PHY
[ 22.165272] b43 bcma0:1 wlp3s0b1: renamed from wlan0
[ 30.826526] b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
使用新内核-4.15
新内核-不好使的情况
不清楚是内核驱动配置的问题，还是固件版本的问题开机dmesg | grep b43
[ 0.774174] b43-phy0: Broadcom 4331 WLAN found (core revision 29)
[ 0.774619] b43-phy0: Found PHY: Analog 9,Revision 1
[ 0.774631] b43-phy0: Found Radio: Manuf 0x17F,Version 1
[ 0.774632] b43-phy0 warning: 5 GHz band is unsupported on this PHY
[ 0.775180] b43 bcma0:1: Direct firmware load for b43/ucode29_mimo.fw Failed with error -2
[ 0.775192] b43 bcma0:1: Direct firmware load for b43/ucode29_mimo.fw Failed with error -2
[ 0.775204] b43 bcma0:1: Direct firmware load for b43-open/ucode29_mimo.fw Failed with error -2
[ 0.775214] b43 bcma0:1: Direct firmware load for b43-open/ucode29_mimo.fw Failed with error -2
[ 0.775216] b43-phy0 ERROR: Firmware file “b43/ucode29_mimo.fw” not found
[ 0.775216] b43-phy0 ERROR: Firmware file “b43-open/ucode29_mimo.fw” not found
[ 0.775217] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all instructions on this website.
