[mhellevang]

Split of #213 (merge order):

1. Bound SBP-2 max_payload by link speed, log posted-write fault address #214 Standalone fixes (max_payload, posted-write, rcvPhyPkt)
2. Read bus-reset generation from SelfIDCount, not reserved 0x06C #215 Bus-reset generation from SelfIDCount ← this PR
3. SBP-2: re-login/reconnect after rediscovery, not on a 100 ms timer #216 Reconnect after rediscovery
4. SBP-2: carry command data by OHCI physical DMA #217 Physical DMA, needs 2+3
5. SBP-2: bus reset only when a logout with a command outstanding fails #218 Recovery/teardown policy, needs 4
6. SBP-2: DMA HBA task data in place via fBufferIOVMAddr #219 Zero-copy, needs 5

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Split out of #213 per review. At the busReset interrupt, HandleInterrupt read 0x06C, which is reserved in the OHCI 1.2 register map. SelfIDCount.selfIDGeneration (bits 23:16) already holds the new generation at the reset edge (Table 11-2), which is what every OnBusResetStarted(generation) consumer needs to drop old-generation work. Matches Apple's move to a new generation at the reset edge (IOFireWireController.cpp:1998-2000).

No host test: none of the generation consumers are reachable from the interrupt fixture without a full SBP-2 rig. HW verification is the generation in the [BusReset]/IRM log lines matching Self-ID. Affects stale-work handling for the whole controller, so a run with an audio device on the bus is welcome; I only have scanners.

[mhellevang]

HW: five bus resets on the LS-9000 (power-cycle, cable pulls) on a build with this + #214 + #216 (d50b605); Self-ID generation VALIDATED 1–5 matched the generation every OnBusResetStarted consumer logged. No audio device on the bus; that run is still open to anyone who has one.

[mrmidi]

who has one
Who it may be...

[mhellevang]

who has one
Who it may be...

I think... I should buy a sound thingy to make testing easier.