error messages with ed(4) and current

Hello,

I've resurrected one of my two ISA-based ed(4) boards, which is used to 
exchange NFS traffic between a client (under -current) and a server (under 
6-RC1). The client is building world over NFS with both src and obj stored on 
the server.

The client is running -current as this this the only version able to set the 
media on the NIC (thanks Warner).

The error messages are :
Oct 26 09:01:18 newmail-fb6 kernel: ed2: device timeout
Oct 26 09:22:30 newmail-fb6 kernel: ed2: device timeout
Oct 26 17:31:51 newmail-fb6 kernel: ed2: device timeout

the NIC is detected as :
%grep ed2 /var/run/dmesg.boot 
ed2 at port 0x300-0x31f iomem 0xd8000 irq 10 on isa0
ed2: Ethernet address: 52:54:4c:1b:90:1b
ed2: type RTL8019 (16 bit) 

So far, the NFS traffic is flowing fine in spite of the previous messages.

The NIC is connected to a cheap switch via a twisted pair cable.

	TfH