Kernel Configuration
You configure the OpenBSD kernel via text files. Like 4.4BSD, OpenBSD doesn’t offer a fancy graphical kernel configuration utility or menu-driven system. Each kernel configuration is on a single line, along with a label indicating the type of entry and a description. Pound signs (#) mark comments.
Configuration Entries
Kernel configuration entries fall into four general categories: options, device drivers, pseudo-devices, and keywords.
Options
Options are hardware-independent kernel functions. Options handle things like filesystems, networking protocols, and compatibility layers.
Option entries look like this:
option FFS # UFS option INET # IP + ICMP + TCP + UDP option CRYPTO # Cryptographic framework
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