Re: machfb still broken for first gen iMacs

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

As for the machfb problems, thanks for confirming that I am not the
only person having this problem.

On Mon, 4 Oct 2010, John Klos wrote:

> I wrote:
>
> > It is interesting that the iMac described here (333MHz) seems not to
> > have the atabus attachment problem that I have on my original Bondi-Blue
> > iMac (233MHz) running NetBSD-5 or later.

> It might be worth loading a new genfb kernel to see if you still get that

I have it building now.  Will try it as soon as I get a chance.

> issue. What drives do you have on your IDE busses? My setup is a little less 
> standard, I think, since the motherboard isn't in a machine and the IDE goes 
> to a SATA drive through an adapter which is master on the primary IDE 
> channel.

My iMac is still in its regular shell with the factory display.  It has
an IBM 20GB 7200RPM IDE disk on the first IDE interface and the factory
CD-ROM (tray-loading) drive on the second IDE interface.

It has to do with something that changed between NetBSD-4 and NetBSD-5.
A NetBSD-4 kernel will attach the IDE/ATA bus and drives just fine, but
NetBSD-5 and later will hang on the attempt (and before any dmesg
output).  Disabling atabus with userconf will let it boot.

The last suggestion was confusion over level- versus edge-triggered
interrupts.  I reported all the information I could gather, but hadn't
heard anything more about it.


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