cas(4) PCI errors

[Dom F]

Hello,

I have a Sun quad gigaswift ethernet card in an ASUS K8V-SE-Deluxe 
motherboard. It's a 64-bit PCI card in a PCI v2.2 32-bit slot. It pretty 
much works fine except I see these errors in /var/log/messages:

Mar  8 12:44:31  kernel: cas2: cas_eint: status 0x123c1010, PCI bus 
error 0x20
Mar  8 12:44:31  kernel: cas2: link state changed to DOWN
Mar  8 12:44:33  kernel: cas2: link state changed to UP
Mar  8 12:47:47  kernel: cas2: cas_eint: status 0x18541016, PCI bus 
error 0x20
Mar  8 12:47:47  kernel: cas2: link state changed to DOWN
Mar  8 12:47:49  kernel: cas2: link state changed to UP
Mar  8 12:50:02  kernel: cas2: cas_eint: status 0x9d41016, PCI bus error 
0x20
Mar  8 12:50:02  kernel: cas2: link state changed to DOWN
Mar  8 12:50:04  kernel: cas2: link state changed to UP
Mar  8 12:50:17  kernel: cas2: cas_eint: status 0x128c1010, PCI bus 
error 0x20
Mar  8 12:50:17  kernel: cas2: link state changed to DOWN
Mar  8 12:50:19  kernel: cas2: link state changed to UP
Mar  8 12:59:45  kernel: cas2: cas_eint: status 0xf141010, PCI bus error 
0x20
Mar  8 12:59:45  kernel: cas2: link state changed to DOWN
Mar  8 12:59:47  kernel: cas2: link state changed to UP
Mar  8 13:02:43  kernel: cas2: cas_eint: status 0x1f5c1016, PCI bus 
error 0x20
Mar  8 13:02:43  kernel: cas2: link state changed to DOWN
Mar  8 13:02:45  kernel: cas2: link state changed to UP

The 2-second ethernet renegotiation hurts the most. I have tried other 
replacement cards but the messages still pop up. Anyone else seen these? 
Currently running 9.1-RELEASE-p6.

The "pciconf -lv" reports this:

cas0 at pci0:3:0:0:        class=0x020000 card=0x00000000 chip=0x0035100b 
rev=0x30 hdr=0x00
     vendor     = 'National Semiconductor Corporation'
     device     = 'DP83065 [Saturn] 10/100/1000 Ethernet Controller'
     class      = network
     subclass   = ethernet

[ditto for cas1, cas2, cas3]

Device attach logs from /var/log/messages:

Mar  8 17:06:30  kernel: cas0: <NS DP83065 Saturn Gigabit Ethernet> mem 
0xfce00000-0xfcffffff irq 17 at device 0.0 on pci3
Mar  8 17:06:30  kernel: miibus0: <MII bus> on cas0
Mar  8 17:06:30  kernel: nsgphy0: <DP83865 1000BASE-T media interface> 
PHY 1 on miibus0
Mar  8 17:06:30  kernel: none, 10baseT, 10baseT-FDX, 100baseTX, 
100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 
1000baseT-FDX-master, auto, auto-flow
Mar  8 17:06:30  kernel: cas0: 16kB RX FIFO, 9kB TX FIFO
Mar  8 17:06:30  kernel: cas0: Ethernet address: 00:03:ba:db:ab:5f
Mar  8 17:06:30  kernel: cas1: <NS DP83065 Saturn Gigabit Ethernet> mem 
0xfd600000-0xfd7fffff irq 18 at device 1.0 on pci3
Mar  8 17:06:30  kernel: miibus1: <MII bus> on cas1
Mar  8 17:06:30  kernel: nsgphy1: <DP83865 1000BASE-T media interface> 
PHY 1 on miibus1
Mar  8 17:06:30  kernel: none, 10baseT, 10baseT-FDX, 100baseTX, 
100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 
1000baseT-FDX-master, auto, auto-flow
Mar  8 17:06:30  kernel: cas1: 16kB RX FIFO, 9kB TX FIFO
Mar  8 17:06:30  kernel: cas1: Ethernet address: 00:03:ba:db:ab:60
Mar  8 17:06:30  kernel: cas2: <NS DP83065 Saturn Gigabit Ethernet> mem 
0xfd000000-0xfd1fffff irq 19 at device 2.0 on pci3
Mar  8 17:06:30  kernel: miibus2: <MII bus> on cas2
Mar  8 17:06:30  kernel: nsgphy2: <DP83865 1000BASE-T media interface> 
PHY 1 on miibus2
Mar  8 17:06:30  kernel: none, 10baseT, 10baseT-FDX, 100baseTX, 
100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 
1000baseT-FDX-master, auto, auto-flow
Mar  8 17:06:30  kernel: cas2: 16kB RX FIFO, 9kB TX FIFO
Mar  8 17:06:30  kernel: cas2: Ethernet address: 00:03:ba:db:ab:61
Mar  8 17:06:30  kernel: cas3: <NS DP83065 Saturn Gigabit Ethernet> mem 
0xfd400000-0xfd5fffff irq 16 at device 3.0 on pci3
Mar  8 17:06:30  kernel: miibus3: <MII bus> on cas3
Mar  8 17:06:30  kernel: nsgphy3: <DP83865 1000BASE-T media interface> 
PHY 1 on miibus3
Mar  8 17:06:30  kernel: none, 10baseT, 10baseT-FDX, 100baseTX, 
100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 
1000baseT-FDX-master, auto, auto-flow
Mar  8 17:06:30  kernel: cas3: 16kB RX FIFO, 9kB TX FIFO
Mar  8 17:06:30  kernel: cas3: Ethernet address: 00:03:ba:db:ab:62

Dom