Including initrd image in kernel

Hi,
first of all I hope this is right forum section for this post, otherwise please move it.
The beginner's guide (http://wiki.archlinux.org/index.php/Beg … tcpio.conf) states that one can include the image generated by mkinitcpio in the kernel to have a "self-contained" kernel. What would one benefit from if doing so? Decreased boot time? I mean the time delay between loading the initrd and mounting the root filesystem is easily 10 seconds on my machine.
I've done some googling on this issue but wasn't able to come up with anything related. The man page of mkinitcpio doesn't give me any hints either. So, how do address this matter or am I missing something obvious?!
Any hints are more than welcome.
Thanks & Cheers

I don't think it would change much, for me it's just a matter of binaries packaging (either way you have to load everything to ram, wether you do it by loading one big binary or 2 small ones shouldn't make any difference). It will definitely not speed up your boot process (10 seconds to mount your *real* root is a lot, do you have special hardware?).
As I see it, it can be useful when deploying this kernel over multiple machines to only have one file that contains everything...

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[SOLVED] Trouble getting initrd-image to work

Hello everyone
I'm trying to get plymouth to work and for that reason I'm messing with initrd images for the first time in my life.
I had no issues generating the image, but once I rebooted, nothing happened. It looks like lilo fails to load the image since I'm not getting the 'Loading initrd-blahblah.img........' message, although I'm not getting any error messages either. Basically it just loads kernel and boots normally like it's never heard of initrd images.
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MODULES="radeon"
HOOKS="base udev plymouth autodetect sata filesystems"
COMPRESSION="lzma"
running mkinitcpio.conf, no errrors there
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:: Begin build
:: Parsing hook [base]
:: Parsing hook [udev]
:: Parsing hook [plymouth]
:: Parsing hook [autodetect]
:: Parsing hook [sata]
:: Parsing hook [filesystems]
:: Generating module dependencies
:: Generating image '/boot/initrd-2.6.35.4-ck1.img'...SUCCESS
/etc/lilo.conf:
lba32
boot=/dev/sdb
compact
prompt
timeout=50
default=2.6.35.4-ck1
read-only
root=/dev/sdb1
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label=plymouth
initrd=/boot/initrd-2.6.35.4-ck1.img
append="quiet splash sata_nv.swncq=1 pci=nomsi snd-hda-intel.model=3stack snd-hda-intel.probe_mask=1 powernow-k8.vcore_list=1125,1125,825"
running lilo shows error message but I've been getting it since I installed arch, and it has been working fine nevertheless.
# lilo
/proc/misc: No entry for device-mapper found
Is device-mapper driver missing from kernel?
Failure to communicate with kernel device-mapper driver.
Added 2.6.35.4-ck1 *
Added plymouth
Added nokms
Added bootchart
Also I think it might be relevant to point out that I'm building my kernels by hand (no PKGBUILDs or anything).
Any ideas will be appreciated
EDIT: solved. forgot to enable support for initramfs/initrd in kernel
Last edited by pussi (2010-09-17 06:47:47)

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OK, back to topic :-)
I just did a bit of research about /etc/mkinitcpio.d/ (indeed, I already have two .preset files), but I could not find any information about excluding files from /etc.
Maybe I should have asked about how to exclude files in general.
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Including initrd image in kernel

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