linux-kernel - Re: [PATCH] m68k: defconfig: Update defconfigs for v5.4-rc1

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Message-ID: <alpine.LNX.2.21.1.1911051444570.160@nippy.intranet>
Date:   Tue, 5 Nov 2019 15:13:31 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Brad Boyer <flar@...andria.com>
cc:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Max Staudt <max@...as.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ide@...r.kernel.org
Subject: Re: [PATCH] m68k: defconfig: Update defconfigs for v5.4-rc1

On Mon, 4 Nov 2019, Brad Boyer wrote:

> 
> I'll try the PB190 first anyway. It should be easier due to not needing 
> to setup a monitor. 

I think you can put the 630 into a standard VESA video mode (with MacOS or 
Linux) given the right adapter/cable. I have a pin-out somewhere.

> I'm not sure if I ever booted Linux on either of them, since I acquired 
> both about the time I started getting too busy to spend time on such 
> things. I just found the Performa, and it's actually a Performa 630CD 
> but I don't see any obvious difference based on the specs.
> 
> I just took a look at the macide driver, and it appears to do basically
> nothing other than pass a list of addresses into the core ide code. It's
> one of the smallest drivers I've ever seen.
> 

The fly in the ointment is interrupt handling. There is a theoretical bug. 
(Though it doesn't seem to hurt in practice.)

AFAIK the hardware is publicly undocumented and so we need to do 
experiments like this:
https://github.com/fthain/linux/commit/01405199e8d05500bf458df690027655f526a7fd

My suspicion is that macide_clear_irq() does nothing useful. It's not 
called on a Powerbook 190. Maybe it is needed on a PowerBook 150 and 
Performa 630, maybe not...

> > But watch out for leaking capacitors and batteries...
> 
> I should pull out every machine in my collection and look for those 
> sorts of issues. None of them have been checked in at least 5 or 6 
> years.
> 

None of the machines in my collection have any batteries now. Desoldering 
the Ni-Cd PRAM battery from a Powerbook 14x/16x/170/180 is difficult but 
necessary. Powerbook 150 and 190 are easier (no desoldering needed).

-- 

> 	Brad Boyer
> 	flar@...andria.com
> 
>