The eicon.diehl Diva-pci is supported by the isdn4l-projekt, for further details have a look at their home-page.As far as i know, only the eicon.diehl isdn-diva ISA V1.0 is not supported.
There is a howto written by Klaus Müller about the instal-lation of isdn-card for the e-smith-box. I tryed the version for the v 4.0 but it didn´t work perfectly for me, the v 4.1.2 should be easier to install (e-smith contributed howtos.
I also use a fli4l-router and I think, they do support the eicon isdn-pci card.
Remembering to the amount of time I wasted to implement an isdn-card into my e-smith box it is very easy, to setup a 386 as an one floppy router under fli4l.
Karl W. Müller