I'm familiar with this fallback behavior in ubuntu, when their initramfs has
a heart attack on some esoteric hardware I have.
Most of the other major unixes that are still left have a kernel managed
dynamic device filesystem.
It seems like a good enough idea to me to have everything necessary to
bootstrap the most basic twenty or so system device nodes that nobody ever
renames strictly from 600 lines of code added to a kernel image.
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