AR724x update: PB92 (atheros) bootstrap; pcie committed; other fixes

[Adrian Chadd]

Hi,

I've committed Luiz's port of the AR724x PCIe bus glue to HEAD. It
doesn't work out of the box for me (I have to disable some workarounds
in it for some reason) so unless you feel like diving in to fix
things, it isn't yet ready for prime time.

I've asked him to verify that it works fine on the Rocket M5 he's been
testing with.

Once we've sorted out what works and what doesn't, I'll look to try
and get it into a decent shape that's usable.

On the upside though, I've now brought up FreeBSD on the PB92
reference board from Atheros (AR8316 switch PHY) and it seems to work
fine.
I'll commit a semi-working configuration file shortly as a reference.


Adrian