From owner-freebsd-alpha Fri Nov 17 9:55:22 2000 Delivered-To: freebsd-alpha@freebsd.org Received: from feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (Postfix) with ESMTP id 0559637B4C5; Fri, 17 Nov 2000 09:55:19 -0800 (PST) Received: from zeppo.feral.com (IDENT:mjacob@zeppo [192.67.166.71]) by feral.com (8.9.3/8.9.3) with ESMTP id JAA15140; Fri, 17 Nov 2000 09:55:13 -0800 Date: Fri, 17 Nov 2000 09:55:11 -0800 (PST) From: Matthew Jacob Reply-To: mjacob@feral.com To: Andrew Gallatin Cc: Bernd Walter , John Baldwin , Christian Weisgerber , freebsd-alpha@FreeBSD.ORG Subject: Re: PC164 IDE only works (was: SMPng stability) In-Reply-To: <14869.25705.810908.875060@grasshopper.cs.duke.edu> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org "what I said" > > An interesting comment found in the linux kernel sources: > > /* In theory, the PC164 has the same interrupt hardware as > the other Cabriolet based systems. However, something > got screwed up late in the development cycle which broke > the interrupt masking hardware. Repeat, it is not > possible to mask and ack interrupts. At all. > > In an attempt to work around this, while processing > interrupts, we do not allow the IPL to drop below what > it is currently. This prevents the possibility of > recursion. > > ??? Another option might be to force all PCI devices > to use edge triggered rather than level triggered > interrupts. That might be too invasive though. */ > > > Drew > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message