CFT: ath hal src switchover

[Sam Leffler]

I've brought the hal source code back to RELENG_7 but not connected it 
to the build and/or driver.  I want folks to test this before I commit 
those changes.  To do this you must have an up to date RELENG_7 code 
base and then apply this patch:

http://people.freebsd.org/~sam/ath_hal-releng7.patch

Then rebuild your kernel.  There should be no changes to user apps.  
Beware however that custom kernel configurations will need to change; 
instead of:

device ath
device ath_hal
device ath_rate_sample

(or similar) you need:

device ath
device ath_hal
options AH_SUPPORT_AR5416
device ath_rate_sample

If you want to configure a subset of the chip support implied by ath_hal 
then you may not need the options line.

If you are using modules note that ath_hal and ath_rate_* modules no 
longer exist; they are now rolled into the ath module.  If you use a 
rate control algorithm other than sample then you'll need to modify the 
ath module build or override by specifying ATH_RATE; e.g.

cd sys/modules/ath
make ATH_RATE=onoe

The updated hal code adds support for several parts but otherwise makes 
no effort to address driver bugs.  You should see no regressions 
relative to operation w/ the older hal.

If you are running the 7.1 release you will need to import the hal code 
that is now in

sys/dev/ath/ath_hal

before following the above instructions.  I have no idea if this will 
work for an earlier version of FreeBSD; if you're not running at least 
7.1 my advise is to upgrade.

Please report any issues to this mailing list.

    Sam