From owner-freebsd-hackers Sun Nov 30 11:02:53 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id LAA25438 for hackers-outgoing; Sun, 30 Nov 1997 11:02:53 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from ns2.cetlink.net (root@ns2.cetlink.net [209.54.54.20]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id LAA25402 for ; Sun, 30 Nov 1997 11:02:43 -0800 (PST) (envelope-from jak@cetlink.net) Received: from hot1.auctionfever.com (ts1-cltnc-46.cetlink.net [209.54.58.46]) by ns2.cetlink.net (8.8.5/8.8.5) with SMTP id OAA14495; Sun, 30 Nov 1997 14:02:28 -0500 (EST) From: jak@cetlink.net (John Kelly) To: John-Mark Gurney Cc: hackers@FreeBSD.ORG Subject: Re: 650 UART, SIO driver, 8259 PIC Date: Sun, 30 Nov 1997 20:03:33 GMT Message-ID: <3482bd16.18797696@mail.cetlink.net> References: <199711292017.HAA16179@godzilla.zeta.org.au> <348095b5.441871@mail.cetlink.net> <19971130002133.00410@hydrogen.nike.efn.org> In-Reply-To: <19971130002133.00410@hydrogen.nike.efn.org> X-Mailer: Forte Agent 1.01/16.397 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by hub.freebsd.org id LAA25415 Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Sun, 30 Nov 1997 00:21:33 -0800, John-Mark Gurney wrote: >I've thought about upgrading sio so that it would understand the >existance of it, but there were a number of problems... the status >register is stored in the scratch register of the fourth port of the >board... also, on the AST/4 the port to write to, to clear ALL the >interrupts When you say "to clear ALL the interrupts," are you talking about an AST-style control register? My board only has a status register, so I don't understand the notion of clearing interrupts by writing to a port. Can you explain the use of an AST-style control register? John