during fedora boot, what picks up the initrd.img from /boot?

John Summerfield debian at herakles.homelinux.org
Fri Nov 30 21:56:19 UTC 2007

Robert P. J. Day wrote:
>   i'm sure i'm going to regret asking this only seconds after i hit
Probably, a little later than a few seconds:-)

> ENTER, but at what point during the boot process does the kernel's
> corresponding /boot/initrd.img file kick in and get used?
>   i'm following along reading the logic of initramfs and early
> userspace, and can see where a compressed cpio archive can be
> incorporated into the kernel image itself.  fair enough.
>   but how does the /boot/initrd.img (which is itself a compressed cpio
> image) get processed during boot?  it's certainly not passed as an
> argument to the kernel as i can see via /proc/cmdline.  so how does it
> affect the boot sequence?  thanks.

What interprets these?
title Scientific Linux SL (2.6.18-8.1.15.el5xen)
         root (hd0,0)
         kernel /xen.gz-2.6.18-8.1.15.el5
         module /vmlinuz-2.6.18-8.1.15.el5xen ro 
         module /initrd-2.6.18-8.1.15.el5xen.img

The bootloader loads it, of course. That's how multiboot works.

For the grubby details, you'll need to read the kernel and/or bootloads 



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