Let me understand one part: CD install normally means that it partitions your disc, installs packages and reboots without a hitch?
The sk98lin driver comes with the 2.6.10 kernel we ship our CD with, but doesn't support the newest Marvell cards. Some Marvell cards work, some don't. But there are new Marvell card drivers that seem to come with the 2.6.12 kernel, but I actually can't accurately tell if I'm not wrong. There don't work with 2.6.10 or 2.6.11.
If you have two network cards in your computer, the on-board Marvell and a PCI one, it is possible that the install CD detects the PCI one only, and uses that, since the install sk98lin driver seems to not be so good as the one in the boot kernel. But after reboot, it could get detected and you get the PCI card shifted one position.
As a simple way out, until stable support for Marvell cards gets released, is to use PCI network cards instead, and disabling the Marvell from the BIOS.
But, if the install CD doesn't see it and the boot kernel does (or it goes the other way around), I would like some feedback on this behavior. Thanks.