[yocto] How to build a custom ramdisk image

[Mercier Ivan]

Hi everybody,

I'm working on an yocto distrib with a freescale p3041 based board.
I would like to modify the root file system, like hostname,udev rules
and build my own ramdisk image.
I use to create my image by
$ bitbake fsl-image-core

is it corret?

should I modidy fsl-image-core.bb?

I try to modify files in
build_p3041ds_release/tmp/work/p3041ds-fsl_networking-linux/fsl-image-core/1.0-r20/rootfs

but modifications are overwrited

can anybody help me?

thanks a lot