GA622T on pc164 with debian unstable

[Andres Meyer <andres.meyer@computer.org>]

HW:
pc164, 500Mhz, SRM Console
sym53c875, 2GB Barrracude, Toshiba CDROM
Netgear GA622T Copper Gigabit, 64bit pci, National Semiconductor DP83820 
chipset
DEC Tulip 100Mbps ethernet

While trying to install a NetGear GA622T Gigabit ethernet card, I ran into 
following problems:

kernel 2.2.19:
boot OK
compile of ns820.c from scyld.com: no problem
insmod: ok, correct message
ifconfig eth1 192.168.0.55: correct, no reaction, eth1 visible with MAC 
address and everything
does not answer pings
route add default gw 192.168.0.254: message: "something wicked happend!"
impossible to send something

kernel 2.4.9-ac7:
boot not possible, detects 100Mhz pci-clock and aborts because its out of 
range while trying to init sym53c8xx driver. When using ncr53c8xx -> driver 
loads, timeout while finding HD.
I tried with all kinds of options and combinations for the scsi drivers, no 
luck.

FreeBSD-STABLE:
boot OK
driver nge loads with correct message
ifconfig works OK
route works OK
when pinging some other host: an ARP packet can be sniffed on the network, 
but with wrong type (0000 instead of 0001 (=arp request)).
does not answer pings

NetBSD1.5.2:
boot OK
did not manage to compile and install kernel&drivers correctly to get them 
working on alpha

Well, so much for that, I think I tried a lot. Any ideas? Debugging 
approaches? Information to add? Other lists to ask? I do speak C, but not too 
much of the alpha-kernel-dialect...

Andres