From owner-freebsd-hackers Wed Jul 30 08:01:22 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id IAA06544 for hackers-outgoing; Wed, 30 Jul 1997 08:01:22 -0700 (PDT) Received: from out2.ibm.net (out2.ibm.net [165.87.194.229]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id IAA06539 for ; Wed, 30 Jul 1997 08:01:20 -0700 (PDT) Received: from slip129-37-195-126.nc.us.ibm.net (slip129-37-195-126.nc.us.ibm.net [129.37.195.126]) by out2.ibm.net (8.8.5/8.6.9) with SMTP id PAA102342; Wed, 30 Jul 1997 15:00:29 GMT From: mouth@ibm.net (John Kelly) To: Michael Smith Cc: msmith@atrad.adelaide.edu.au, freebsd@atipa.com, hackers@FreeBSD.ORG, terry@lambert.org Subject: Re: Sharing interrupts Date: Wed, 30 Jul 1997 15:02:32 GMT Message-ID: <33df4e3f.1984385@smtp-gw01.ny.us.ibm.net> References: <199707300902.SAA21210@genesis.atrad.adelaide.edu.au> In-Reply-To: <199707300902.SAA21210@genesis.atrad.adelaide.edu.au> 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 IAA06540 Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Wed, 30 Jul 1997 18:32:58 +0930 (CST), Michael Smith wrote: >Qool! More to the point, thanks for the less-technical recipie. >Aside from the odd gripe, I reckon it's worth adding to the handbook >in a 'munging your hardware for useful results' section. BTW, I used a meter to measure and verify all the voltages given in that recipe. With two machines connected via serial ports and a crossover cable as outlined in the handbook, I used the kernel debugger to step through sioprobe line by line, noting the voltage levels and when they changed. That in itself was educational. Even if my recipe has little project value for most readers, I think adding it to the handbook (with some of the caveats you mentioned) will help future readers better understand interrupt sharing and how FreeBSD supports non-intelligent multiport serial cards. When I first read the FreeBSD docs and man page on that topic, I was confused. Some of it is unclear and misleading. John