[Q] Device drivers in the Kernel or the ROM?

I've been rooting phones for a few years and it always seems to amaze me how much different a device driver can be depending on what ROM is installed even with the same kernel. In most of my years as a sysadmin, many drivers are compiled into the kernel, but there are many that can be added during the init process.

My question is, how does the android kernel/ROM function in respect to drivers such as Bluetooth? Do most of the developers add them into the Kernel or as some piece of the ROM?

Thanks.

J

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