Turbo Mode and Turbo Channels

I have a question regarding turbo mode configuration.

I know that madwifi only supports static turbo mode.   It seems that I
can only operate in turbo mode on channels that are labeled as static
turbo mode (ie. as shown by the output of: wlanconfig ath0 list
channels)

802.11g channel 6 is supposed to support turbo mode.  However, my
SuperG cards all show channel 6 as being a *dynamic* turbo channel,
and not surpisingly, turbo mode will not work.  On the other hand, I
am able to get turbo mode working on the handful of  802.11a (5 GHz)
channels that are shown as static turbo channels

I've used the default countrycode, and also tried countrycode=0.   No
difference.

So.... to my questions...   Is channel 6 universally considered a
dynamic turbo channel?  Does that mean that madwifi cannot support
802.11g turbo mode?  Is there any way to override channel 6 to be
configured as a static turbo channel?   Or is this hardware specific
(and if so, are there cards known to support 802.11g static turbo on
channel 6 with madwifi?)

thanks,

Marc

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