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

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 root=/dev/VolGroup00/LogVol00
module /initrd-2.6.18-8.1.15.el5xen.img
savedefault


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 source.

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Cheers
John

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