Generic x86_64 System

This is the base Nerves System configuration for a generic x86_64 system.

Please contact me about this if you're really interested in it. I don't maintain it, and unless you really dig through the code, it's not going to be obvious how it works. I'm happy to help if you're really interested.

Root disk naming

If you have multiple SSDs, or other devices connected, it's possible that Linux will enumerate those devices in a nondeterministic order. This can be mitigated by using udev to populate the /dev/disks/by-* directories, but even this can be inconvenient when you just want to refer to the drive that provides the root filesystem. To address this, erlinit creates /dev/rootdisk0, /dev/rootdisk0p1, etc. and symlinks them to the expected devices. For example, if your root file system is on /dev/mmcblk0p1, you'll get a symlink from /dev/rootdisk0p1 to /dev/mmcblk0p1 and the whole disk will be /dev/rootdisk0. Similarly, if the root filesystem is on /dev/sdb1, you'd still get /dev/rootdisk0p1 and /dev/rootdisk0 and they'd by symlinked to /dev/sdb1 and /dev/sdb respectively.