Comment # 16 on bug 990374 from Dominique Leuenberger

(In reply to Steffen Winterfeldt from comment #15)
> You could, instead of patching various boot loader config files, add the
> option by appending some blob to the initrd, containing a linuxrc config
> file.
> 
> Say, like:
> 
> # ll etc/linuxrc.d/10_netiso 
> -rw-r--r-- 1 snwint suse 9 Jul 26 09:57 etc/linuxrc.d/10_netiso
> # cat etc/linuxrc.d/10_netiso 
> kexec: 1
> # find . | cpio -o -H newc | xz --check=crc32 -c >>INITRD

Yes, I've found some code in kiwi that does that for the install sources...
based on bug 916175 fixes