thanks a lot for that feedback. I did have INITRD_MODULES line with some values for it in the /etc/sysconfig/kernel file all right. I uncommented the whole line, rescue then chroot and then mkinitrd it did then rebuild the last block/entry as well for the 6.4.0 kernel just as well without errors this time. system boots now fine in 15.6rc with the first default 6.4.0 kernel entry just as well. do we not need this INITRD_MODULES variable any more at all? in mine there are such things as reiserfs and PIIX4 or those old chipset intel controllers and what not. thanks.