Why (802.11a)5GHz wifi not support ?

[hbl0307106015]

Hi ,
I found that the capwap-split_mac does not support 11an band. Thus I try to add some new code for making 80211A band work. However I failed with error "Failed to stop TX DMA queue=0x004!"
After I adding my code, the 5GHz client can get IP from dhcp server, but the WTP failed to send packet to client, such as 'ARP reply', which result in client can not study the arp table well.
Any resolution on this issue? thanks.