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. "PMU_WHITNEY_BASED". 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 battery. (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... http://nubus-pmac.sourceforge.net/#booters Laurent, does Emile work on these machines? --
Cheers, Ben.
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