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I've unpacked the cpio file initramfs-4.19.10-200.fc28.x86_64.img and only found this:

.
├── early_cpio
└── kernel
    └── x86
        └── microcode
            └── GenuineIntel.bin

Has this initramfs only one file? Years ago, I remember that such a files had a mini-filesystem. Where are those files now?

The OS is Fedora 28

  • Just unpacked the file in Ubuntu kernel 4.15.0-46 and got similar result. I suppose that early_cpio is not part of the initramfs because I don't have anything similar in my case (and you said "only one" file). If this is the case please edit the question accordingly. – Weijun Zhou Mar 12 at 0:34
  • Interesting, maybe you can try to directly boot your OS without it, remember to pass root and init arguments to kernel. It seems like Fedora kernel doesn't run a init from initramfs now. – 炸鱼薯条德里克 Mar 12 at 2:39
3

initramfs images can contain multiple segments, and it’s common nowadays to have a short cpio archive containing early-boot files (such as microcode updates) before the main, compressed, cpio archive. In such circumstances you can use a tool such as lsinitramfs (on Debian and derivatives) or lsinitrd (on Fedora, RHEL and derivatives) to view the full contents of the initramfs.

(lsinitramfs doesn’t support multi-segment files in general, but it does handle the special case described above. lsinitrd also supports the special case described above, I’m not sure whether it supports other multi-segment images.)

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