[ath9k-devel] EnGenius EMP9602 mini-PCI Wireless Card

[Cristian Talle <ctalle@voiceway.ca>]

Hi,

I'm trying to get the EnGenius EMP9602 mini-PCI Wireless Card (Atheros 
AR9160 + AR 9103) working on a Micrel KS8695P system (arm 922T) with 
kernel 2.6.32.5.
The card runs fine except for the messages I'm getting in the system log :

Feb 2 17:02:33 (none) user.debug kernel: ath9k: received PCI FATAL 
interrupt...
Feb 2 17:02:33 (none) user.debug kernel: ath9k: Failed to stop TX DMA in 
100 ms...
Feb 2 17:02:33 (none) user.debug kernel: ath9k: Unable to stop TxDMA. 
Reset HAL...

The driver doesn't crash (it's built in the kernel) but downloading 
through the wireless link is VERY unreliable (100-200kbps) while the 
upload is constant (so far I got 2Mbps but it was limited by the other 
endpoint).

We have the PCI bus running @ 33MHz with the CPU DMA cache size of 3KBytes.

I've seen a lot of similar posts about the same type of error and all 
the replies I found say - it's harmless, the system is recovering.. etc.
It's true that the driver seems to be fairly stable but the _cause_ of 
this problem needs to be found so that performance is not impacted.

I also tried the latest version of the kernel (2.6.33-rc6) but I get the 
same error, on top of the fact that ioctl seems to have been changed (I 
get Operation Not Supported when trying to add wlan0 to a bridge).

Is there anyone out there that has ath9k working reliably with AR9160 or 
is the Tx DMA problem common across the board?

Thank you,
Cristian