sk0 problems on an Asus K8VSE Delux

[Lawrence Farr]

Hi,

I have problems with my sk0 on an Asus K8V SE Deluxe board:

skc0: <Marvell Gigabit Ethernet> port 0xb000-0xb0ff mem
0xfdb00000-0xfdb03fff irq 10 at device 10.0 on pci0
skc0: Yukon Gigabit Ethernet 10/100/1000Base-T Adapter
sk0: <Marvell Semiconductor, Inc. Yukon> on skc0
sk0: Ethernet address: 00:11:2f:08:14:9d
miibus0: <MII bus> on sk0
e1000phy0: <Marvell 88E1000 Gigabit PHY> on miibus0
e1000phy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX-FDX,
auto
skc0: [GIANT-LOCKED]

It's built in to the board.
Running 5.2.1, or CURRENT from today, the interface stops if you
use CVSUP or NFS after a few seconds. If you ifconfig down it a 
few times, then bring it back up, it will be working again for a 
few seconds. 

FTP downloading doesn't cause it tho, strangely (I got bored after
downloading about 10Gb).

It seems I'm not alone in this:

http://www.mail-archive.com/freebsd-net@freebsd.org/msg11590.html

Anyone got any ideas where to start looking? ACPI and APIC enabled
or disabled makes no difference. I've also put the newest BIOS
available on. Switch on the other end is a Summit Extreme 48.

Many thanks

Lawrence Farr
EPC Direct Limited