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

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Date:   Tue, 12 Jun 2018 09:47:06 +1000 (AEST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:     Michael Schmitz <schmitzmic@...il.com>,
        Andreas Schwab <schwab@...ux-m68k.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-m68k@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Laurent Vivier <lvivier@...hat.com>
Subject: Re: [PATCH v2 08/12] macintosh/via-pmu68k: Don't load driver on
 unsupported hardware

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.
>