Re: [PATCH v2 08/12] macintosh/via-pmu68k: Don't load driver on unsupported hardware

From: Finn Thain
Date: Mon Jun 11 2018 - 19:46:52 EST

On Sun, 10 Jun 2018, Benjamin Herrenschmidt wrote:

> Pre-PCI is basically "NUBUS" based even in absence of an actual NuBus
> slot :-) It has to do with the internal HW architecture. The only ones
> that aren't are the even older designs (the 68000 based ones).

There is already some disagreement in the comments in the nubus-pmac code
about the suitability of "PMU_NUBUS_BASED" as opposed to e.g.

Point is, the PMU driver doesn't care about the expansion slots or
architecture (Whitney-based PMU appears on m68k and powerpc). So NuBus vs.
PCI is a red herring here. The pmu_kind relates to backlight, buttons and

(Leaving aside the PMU driver, if a pre-OpenFirmware Mac has a "slot zero"
ROM, one can argue that it is actually a NuBus machine, regardless of any
actual expansion slots.)

> What's the situation with those NuBus things ? What do they use as a
> bootloader ? The old Apple one or BootX ? We should merge that port of
> it's maintained.

I agree that this code should not languish out-of-tree. But it would need
more work before it could reasonably be submitted to reviewers.

I do have some nubus-pmac hardware but I also have more mac/68k driver
work to do before I can tackle another architecture.

I don't know what the bootloader situation is, but it looks messy...

Laurent, does Emile work on these machines?


> Cheers,
> Ben.