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After reading this link, I've known why we need the initrd. As my understanding, after the kernel is loaded into RAM, the initrd does two things:

  • loading necessary drivers;
  • mount the real root filesystem.

So we can find a kernel, an initrd and a root filesystem in any ISO.

My question is: who is in charge of offering the file initrd?

The kernel developer? the driver developer? or the different Linux distributors?

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