interrupt storms with AR5414 on 6.3 RELEASE

[huub]

I have a problem running the Atheros AR5414 wireless mini-pci-card
(Compex model WLM54AGP23) with FreeBSD 6.3-RELEASE (GENERIC i 386) on a
Soekris 4521.

I get lots of messages:
"interrupt storm detected on "irq10:"; throttling interrupt source" 
and 
"ath0: device timeout"

And after sometime the interface stops functioning.

Anybody any suggestion?
Thanks,
Huub


Information on system follows:


# dmesg:
....
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413,
RF5413)
.....
ath0: <Atheros 5212> mem 0xa0000000-0xa000ffff irq 10 at device 16.0 on
pci0
ath0: Ethernet address: 00:80:48:54:c0:92
ath0: mac 10.5 phy 6.1 radio 6.3

# ifconfig
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::280:48ff:fe54:c092%ath0 prefixlen 64 scopeid 0x1 
        inet 172.16.0.214 netmask 0xfffffffc broadcast 172.16.0.215
        ether 00:80:48:54:c0:92
        media: IEEE 802.11 Wireless Ethernet autoselect (DS/2Mbps)
        status: associated
        ssid ap-omni.renv0.wleiden.net channel 1 bssid 00:02:6f:06:d6:14
        authmode OPEN privacy OFF txpowmax 46 protmode CTS bintval 100

# wicontrol -i ath0
NIC serial number:                      [  ]
Station name:                           [ CNodeHuub.wLeiden.NET ]
SSID for IBSS creation:                 [ ap-omni.renv0.wleiden.net ]
Current netname (SSID):                 [ ap-omni.renv0.wleiden.net ]
Desired netname (SSID):                 [ ap-omni.renv0.wleiden.net ]
Current BSSID:                          [ 00:02:6f:06:d6:14 ]
Channel list:                           [ ffe 0 1110 1111 1 0 0 0 0 2220
22 ]
IBSS channel:                           [ 1 ]
Current channel:                        [ 1 ]
Comms quality/signal/noise:             [ 0 24 0 ]
Promiscuous mode:                       [ Off ]
Intersil-Prism2 based card:             [ 1 ]
Port type (1=BSS, 3=ad-hoc):            [ 1 ]
MAC address:                            [ 00:80:48:54:c0:92 ]
TX rate (selection):                    [ 0 ]
TX rate (actual speed):                 [ 2 ]
RTS/CTS handshake threshold:            [ 2346 ]
Create IBSS:                            [ Off ]
Access point density:                   [ 1 ]
Power Mgmt (1=on, 0=off):               [ 0 ]
Max sleep time:                         [ 100 ]
WEP encryption:                         [ Off ]
TX encryption key:                      [ 0 ]
Encryption keys:                        [  ][  ][  ][  ]