If I remember correctly, the initrd ramdisk is freed back once you 
switch over to the real root filesystem. I don't remember if you have to 
do anything special other than switching to the real root.

This page has some more info.

http://www.ibm.com/developerworks/linux/library/l-initrd.html

kitepilot@kitepilot.com wrote:
> OK, I did it...
> I compiled an all-modules kernel and I am using udev inside my initramfs 
> init to find my root partition and boot the system.
> It works cool...  :) 
>
> It wasn't easy, and after lots of tries with klibc-1.5, I gave it up and 
> went to a straight glibc (2.8-20080929). 
>
> Also, sorting out modules dependencies was a $%#& (challenge  :), so I just 
> included every freaking-existing-module-under-the-Sun into my cpio tree.
> Along with a bunch of commands and glibc libraries.
> That yielded a generous 30MB worth of junk to boot from.
> In memory...
> Still with me?
> Good...   :) 
>
> Now my question is:
> Where do those 30MB go to after boot?
> Are they released back to the pool or are they held hostage in RAM forever? 
>
> I'm dizzy and crossed-eyed reading kernel documents/messages and I just 
> can't come up with a straight answer.
> I think I'm gonna puke depmods...   :(
> Does anybody know?
> ET 
>
> PS: BTW, this is an LFS installation, nothing fancy...
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