Re: Booting original iMac

[Michael <macallan%NetBSD.org@localhost>]

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Hello,

On Mar 14, 2010, at 12:38 AM, John D. Baker wrote:

> On Fri, 12 Mar 2010, Michael wrote:
>
> > I see neither USB nor IDE devices attaching. How long did it sit  
> > there? If USB is the problem there might be error messages after a  
> > few minutes but I'd guess there's something wrong with the IDE  
> > driver :/
>
> Bingo!
>
> I got around to booting a -current kernel and disabled wdc via  
> userconf. The machine booted up fully (aside from not having access  
> to local disk
> or CD-ROM).
>
>  http://bobdbob.com/~jdbaker/imac-GENERIC-current.txt
>
> The same is true for NetBSD-5.0_STABLE:
>
>  http://bobdbob.com~jdbaker/imac-GENERIC-nb5.txt
>
> OK, so what changed about "wdc* at obio" between -4 and -5?

A lot. Not so much in the wdc driver itself but in the way the PCI and  
other bus abstractions work.
So, my first guess would be that we for some reason don't get the  
interrupt type right ( as in level vs. edge trigger - the IDE bus(es)  
get probed with interrupts enabled, if we miss things here we'll  
lose ). OF is supposed to tell us what kind of interrupt we need, of  
course in some cases it doesn't so we have to guess - as far as I know  
all pre-uninorth wdc at obio used edge triggered interrupts ( my beige  
G3 and PB3400c certainly do but who knows, the iMac may be an  
exception )
So, what's in your wdc's interrupts ( or AAPL,interrupts ) property?

have fun
Michael

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