Subject: Re: How to probe for a QBus device?
To: Jochen Kunz <email@example.com>
From: Anders Magnusson <firstname.lastname@example.org>
Date: 01/25/2002 20:53:28
> * Force the controller to interrupt.
> I know that that was the way in 4.xBSD. According to driver(9) NetBSD
> runs autoconf(9) when interrupts are disabled. So I designed a rfc_match
If the docs say that, it's wrong. I assume that it is arch dependent; the
Unibus needs an interrupt to be generated to find the interrupt vector
and interrupt level (and sometimes to verify the existance of a device).
> that does not generate an interrupt.
> Now I get from sys/dev/qbus/uba.c:ubasearch()
> rfc0 at uba0 csr 177170 didn't interrupt
> I had a look at this fuction and it seams that it needs to get an interrupt
> from the child device to catch the interrupt vector. Is that correct?