========== LIVE FIREWIRE REACHABILITY CHECK ==========
Guest: DragonFly 6.5-DEVELOPMENT #0 (with-src, INVARIANTS ON)

Evidence:
- firewire compiled INTO kernel (4 entries in GENERIC: firewire, sbp, fwe, fwip)
- fw_bus_explore_callback, fw_write, fw_read: ALL in kernel symbols
- BUT: 0 FireWire controllers detected (pciconf -lv shows none)
- BUT: 0 OHCI controllers (PCI class 0x0c0010 = none found)
- BUT: /dev/fw* DOES NOT EXIST (no device nodes)
- BUT: QEMU does NOT emulate FireWire/OHCI hardware

fw_bus_explore_callback: only called during FireWire bus enumeration,
  which requires an attached fwohci OHCI controller. No controller = no
  bus exploration = function never called.

fw_write/fw_read: require open /dev/fw* device node. Device nodes are
  created by firewire_attach when a controller is probed. No controller =
  no device nodes = open() fails = functions unreachable.

Conclusion: FireWire code IS compiled into the kernel but is UNREACHABLE
  without FireWire hardware. QEMU does not emulate FireWire.