
Add "bcache" to boot.initrd.availableKernelModules if a bcache device is detected. This fixes a problem I've had one too many times: I install NixOS and forget to add "bcache", resulting in an unbootable machine (until fixed with Live CD). Now NixOS will do it for me.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.