Make SPI direct configuration less #ifdef'y. No more checking what kind
of platform device tree; instead, use a device call to enumerate the
direct config children of the bus.

- Define a device call for PCI bus instances to fetch a direct child's
device handle given the device's device/function #s (extracted from
a pcitag_t). Use it to associate the handle with the child device
at config_found() time.
- Implement this device call for ACPI and OpenFirmware.
- Enable the OpenFirmware variant for evbarm FDT, macppc, ofppc, sparc64.
- Obsolete acpi_device_register(); it is no longer needed.
- Obsolete setting the OpenFirmware handle in PCI devices in the
sparc64 device_register(); it is no longer needed.

branches: 1.16.4; 1.16.6;
Split the i2c and spi stuff out into their own files.

branches: 1.15.4;
make OpenFirmware info available via sysctl.ofw
tested on macppc, shark and sparc64

branches: 1.14.18;
fix FDT build without openfirm pseudo-device

branches: 1.13.90; 1.13.110;
pull in ofw_subr.c with openfirm so we can use stuff like of_compatible()
without ofbus

branches: 1.12.22; 1.12.52; 1.12.58;
Fix a latent bug uncovered by the new autoconfiguration code: make
sure the "ofbus" device carries the "ofbus" interface attribute.

This is the other part of the fix for PR #18433.

branches: 1.11.2; 1.11.4;
Add openfirmio which is an ioctl interface to OpenFirmware.

Update several ports to at least work again without IPKDB
after the update of that.
Sorry for breaking this with my last changes :-(.
Fixes PR#9671 by Lennart Augustsson.

branches: 1.9.14;
Add common OpenFirmware network interface functions. Currently supports
decoding the `supported-network-types' and `chosen-network-type' properties
into ifmedia words.

Several things:
Clean up the name space here a bit.
Add a `busname' element to struct ofprobe (now struct ofbus_attach_args), and
check against it.
Nuke `ofroot'.
Rename the `openfirm' attribute to `ofbus'.

Remove "class" declarations, and add "devclass" declarations where
appropriate. Fix several inconsistencies between device class and
attributes. Mostly from Chris Demetriou.

add ofw_subr.c, a file containing common OFW routines.

Update for config changes.

RCS id police.

New ARP system, supports IPv4 over any hardware link.

Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.

For the detailed change history, look at the commit log entries for
the is-newarp branch.

branches: 1.2.6;
Rename recently checked in KGDB to IPKDB to resolve conflicts with older KGDB

PowerPC port