/dev during boot

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Hi,

I am trying to understand what is happening to /dev during the boot.

1. initrd is mounting /dev as tmpfs and creates few nodes (console, null, zero, pts, shm)

2. initrd is starting udev

3. initrd loads some modules and starts udev again

4. When the kernel boots it does a similar trick (This I base only on reading the boot-printouts, so I can't say I'm sure about it).

why are all these steps necessary?


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