[Bug 524893] Re: Can't boot initramfses

[Dave Martin]

The initramfs image is an optionally gzipped cpio archive (which must
have been built with cpio --format=newc in order for the kernel to
recognise it --- note this is not the default behaviour for cpio).  The
filesystem is unpacked into a ramfs or similar, so there is no special
size restriction. The first user process to run in the initramfs is
usally /init I believe.

[ 1.846490] rootfs image is not initramfs (junk in compressed archive);
looks like an initrd

The kernel always falls back to assuming initrd if the ramdisk image
doesn't look like a cpio archive (which is just a whole filesystem image
which is dumped into a ramdisk block device, which must be big enough,
and mounted).

If the initramfs image was built by hand, it might have been built
wrongly; otherwise I guess there may be a kernel or qemu problem, or the
image is truncated etc.

-- 
Can't boot initramfses
https://bugs.launchpad.net/bugs/524893
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