ATAng: completely broken? Trouble with HPT370 on 4.9RC3

ATAng seems to cause nothing but trouble for me. It won't recognize
HPT370 arrays at all (whereas older 5.1 Kernels work perfectly) and
just goes on complaining it can't mount root from it. Promise RAID is
somewhat better (can mount root from it but goes on telling me one of
the subdisks is down when it clearly isn't) and finally it doesn't seem
to even recognize disks connected to a VIA VT8325 southbridge at all.
Silicon Image SATA seems to work at times (no RAID at all though) but
then starts throwing timeouts under make buildworld loads whereas CVSUP
works nicely as far as I can tell.

Further, 4.9RC3 also gives me headaches with HPT370 but seems to work ok with
Promise RAID, didn't try SATA or VT8325 so far. I'd definitely vote
for delaying 4.9 until some more people have beaten on the ATA drivers
in there (I don't have any Intel machines so I can't check those chipsets).

I'll try the same system with 4.8 later today and report if its the
hardware or the software (I'd guess the latter as older 5.1 builds
worked nicely).