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Gentoo and Intel Corporation Centrino Advanced-N 6235

emerge sys-kernel/linux-firmware and locate iwlwifi-6000g2b-6.ucode (which sould be located at /lib64/firmware/iwlwifi-6000g2b-6.ucode)
set the following options in your kernel config.


Device Drivers  --->
    Generic Driver Options  --->
        -*- Userspace firmware loading support
        [*]   Include in-kernel firmware blobs in kernel binary
            (iwlwifi-6000g2b-6.ucode) External firmware blobs to build into the kernel binary
            (/lib64/firmware) Firmware blobs root directory
        [*] Fallback user-helper invocation for firmware loading
    [*] Network device support  --->
        [*]   Wireless LAN  --->
            <M>   Intel Wireless WiFi Next Gen AGN - Wireless-N/Advanced-N/Ultimate-N (iwlwifi)
            <M>     Intel Wireless WiFi DVM Firmware support

If it work you should see somthing similar within dmesg like this:


[    3.695960] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N 6235 AGN, REV=0xB0
...
[   40.945526] iwlwifi 0000:03:00.0: L1 Disabled - LTR Disabled
[   40.953509] iwlwifi 0000:03:00.0: Radio type=0x2-0x1-0x0
[   41.226936] iwlwifi 0000:03:00.0: L1 Disabled - LTR Disabled
[   41.233974] iwlwifi 0000:03:00.0: Radio type=0x2-0x1-0x0

References:
https://wireless.wiki.kernel.org/en/users/Drivers/iwlwifi
https://forums.gentoo.org/viewtopic-p-7715914.html
https://forums.gentoo.org/viewtopic-t-1001638.html
https://forums.gentoo.org/viewtopic-t-1023622.html
https://fitzcarraldoblog.wordpress.com/2012/09/08/how-to-install-the-linux-firmware-package-in-gentoo/