Date: Thu, 18 Sep 1997 09:13:06 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: hackers@FreeBSD.ORG Subject: Re: INB question Message-ID: <19970918091306.RY00955@uriah.heep.sax.de> In-Reply-To: <199709180041.RAA21191@usr04.primenet.com>; from Terry Lambert on Sep 18, 1997 00:41:48 %2B0000 References: <199709180041.RAA21191@usr04.primenet.com>
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As Terry Lambert wrote: > If a device doesn't exist, what does inb return? 0xff, right? Often. More exactly, it returns a random value with a tendency to 0xff. > Specifically, how do I know if something lives at a given port? Use a real bus where access to a non-existing address causes a bus error. Forget about ISA. :-/ -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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