Yeah, it is called initrd-tools.
I had a similar problem not long ago.
Are you installing the kernel the "Debian way" or just normally ?
There is a link here on how they do it,
which worked well for me, but there is a line that says,
"fakeroot make-kpkg --revision=custom.1.0 kernel_image".
You just have to insert "--initrd", so the line says,
"fakeroot make-kpkg --initrd --revision=custom.1.0 kernel_image"
then it should work, if that is what your after ?