[Linux Kernel] How to compile ASUS_WMI & ASUS_NB_WMI

I want Fn+F9 can work. So the follow step is procedure for my testing. It work.

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make menuconfig

Device Drivers → X86 Platform Specific Device Drivers

Tick up

<M>   WMI  (will open - < >   ASUS WMI Driver)

Tick up

    <M>   ASUS WMI Driver (when tick up this time will tick up another item was called Asus Notebook WMI Driver)
        <M>     Asus Notebook WMI Driver

Check .config

[happy@localhost linux-4.6.2]$ grep -inr "asus_wmi"  .config
3177:CONFIG_ASUS_WMI=m
[happy@localhost linux-4.6.2]$ grep -inr "asus_nb_wmi"  .config
3178:CONFIG_ASUS_NB_WMI=m

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How to find the method. I check my .config in my archlinux. The command like below.
zcat /proc/config.gz > .config

And I find my settings in my archlinux have two option have been opened.
CONFIG_ASUS_WMI=m
CONFIG_ASUS_NB_WMI=m

So I decide to download the linux kernel to find how to make those two option appear on my .config.

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Why I want try this option, because my touchpad(Fn+F9) no work. I search other information that told me maybe I need this kernel module. So I want to compile it, and try if this module can let my touchpad work or not.

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After set up the .config, then we need to start compile our kernel.
There have two method can do this job.

Method 1:
Use genkernel to compile kernel.

A: No specific .config
    genkernel all (Builds all stages — the initrd, kernel image and modules.)

B: Specific .config
    genkernel --config=/path/to/genkernel.conf all

Method 2:
Copy the bzImage to /boot
/usr/src/linux/arch/x86/boot/bzImage –> /boot

Generate initramfs
genkernel --install initramfs

Edit /boot/loader/entries/gentoo.conf

title Gentoo Linux
initrd /initramfs-genkernel-x86_64-4.4.6-gentoo
linux /bzImage
options root=/dev/sda2 rw

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Reference:

• [Kernel][Archlinux] Replace new kernel method
• genkernel/en
• 深入理解 Linux 2.6 的 initramfs 機制 (上)
• Custom Initramfs