I ask you: how drivers are compiled into the kernel ?

I upgraded the kernel to 2.6.32 , the startup does not recognize the hard disk ,
I was told I might drive you have problems starting .
I want to ask :
How do I know what kind of hard disk driver ?
Where can I download drivers for the hard disk ?
how the drivers are compiled into the kernel ? ( It should not
re- compile the kernel all right )
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you can start setting your BIOS, see SCSI controller settings what ACHI mode or what , try to select another mode.
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since you need to be compiled into the kernel recompile all , probably modify three files Makefile Kconfig. config
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there are many online information is available , landlord can google it .