Darwin boot loader level flags, for Darwin version 8.0:
-v = verbose mode. Basically tells you wants happening during boot up.
-x = Safe mode. Basically boots your system with the bare minimum kexts.
-s = Single user mode. Command line only mode. Allows you to run commands as root to fix system.
-f = Tells the machine to reload all kext and dump the boot configuration cache, (kext cache found in: /System/Library/Extensions.mkext, you can delete it manually and the system will recreate it).
"Graphics Mode"= Tells the system what resolution width, height, color depth & refresh rate to boot the OS with.
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