hi, all:
as the subject, is there any way to make initramfs.img by hand, with out make install kernel?thanks!(English is poor, hope you understand)

Do you mean initrd.img (initial-ram-disk)?

It is kernel file, when you install kernel, it creates for you.

This is the wikipedia opinion about initrd.img and it clears all thing about it.
You want to make it manually, correct? what do you mean by that?
If you are thinking , open a text editor, paste the content and save again process makes this file, You are mistaken.

If you want to learn about this, click here.

1 members found this post helpful.

dear eklavya:
thanks for your answer, it is so meaningful for me. i want to make initial-ram-disk manually, i know it will be build when install kernel. and i know the function of it. but i don't know how to make it manually. actually, i want to built a linux system all from source code, just like LFS. Any advice is appreciate. thanks again!

An initrd image is needed for loading your SCSI module at boot time. If you do not need an initrd image, do not make one and do not edit lilo.conf or grub.conf to include this image.

The /sbin/mkinitrd shell script can build a proper initrd image for your machine if the following conditions are met:

1) The loopback block device is available.

2) The /etc/modules.conf file has a line for your SCSI adapter; for example:
To build the new initrd image, run /sbin/mkinitrd with parameters such as this:
In the above example, /boot/initrd-2.4.7-3.img is the filename of the new initrd image. 2.4.7-3 is the kernel whose modules (from /lib/modules) should be used in the initrd image. This is not necessarily the same as the version number of the currently running kernel.

If you don't find above info suitable for you, try this

dear eklavya:
thanks your help, i think i got the way. best wishes