[Madwifi-devel] ath_hal 0.9.30.13 doesn't support half/quarter channel bandwidth?

[JUN J <o....@ya...>]

I want to use half/quarter channel bandwidth with my wifi card, below is the procedure.

1. 
get the sourcecode from  http://mirror2.openwrt.org/sources/madwifi-ng-r2420-20070602.tar.gz and patched it with http://madwifi.org/ticket/1367 and could successfully compile and run.

2. 
set the regdomain of my wifi card to 0 with ath_info as well as set the countrycode to 842. But I still cannot see any change as I use iwlist to list all the channels.

I tracked down the source code I found it is the function: 
ath_hal_init_channels(ah, chans, IEEE80211_CHAN_MAX, &nchan,
            ic->ic_regclassids, IEEE80211_REGCLASSIDS_MAX, &ic->ic_nregclass,
            cc, HAL_MODE_ALL, outdoor, xchanmode)) 
called by ath_getchannels()
called by ath_attach()
in file ath/if_ath.c 
actually read channel information from the hardware.
but the result it read is to set every channel's ic_flags is 0xC0 which is not including the flags IEEE80211_CHAN_HALF and IEEE80211_CHAN_QUARTER. So the HAL could not be allowing me to use the half/quarter bandwidth.

Is it possible to make half/quarter bandwidth to work if I replaced the HAL 0.9.30.13 with some other versions?

Thank you very much.