From owner-freebsd-hardware Sat Oct 31 20:32:03 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA06558 for freebsd-hardware-outgoing; Sat, 31 Oct 1998 20:32:03 -0800 (PST) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from austin.polstra.com (austin.polstra.com [206.213.73.10]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA06553 for ; Sat, 31 Oct 1998 20:32:01 -0800 (PST) (envelope-from jdp@austin.polstra.com) Received: from austin.polstra.com (jdp@localhost) by austin.polstra.com (8.9.1/8.9.1) with ESMTP id UAA24975; Sat, 31 Oct 1998 20:31:07 -0800 (PST) (envelope-from jdp) Message-Id: <199811010431.UAA24975@austin.polstra.com> To: dg@root.com cc: Greg Lehey , hardware@FreeBSD.ORG Subject: Re: Mixing 8- and 16-bit shared memory ISA cards In-reply-to: Your message of "Sat, 31 Oct 1998 19:55:32 PST." <199811010355.TAA01865@implode.root.com> Date: Sat, 31 Oct 1998 20:31:07 -0800 From: John Polstra Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > It affects all machines with ISA busses, not just early x86. The ed > driver goes to great pains, however, to attempt to work around this > problem by putting 16bit cards into 16bit memory mode only while > actually accessing them. The rest of the time they are left in 8bit > mode. So you should be able to mix them in the same 128K region in > this specific case, but GENERALLY you cannot. Thanks for the info! That explains why I didn't see problems when I "should" have. Speaking of such matters ... The manual for my SMC 8013 card says that the card can be put into either an 8-bit or a 16-bit slot. (It's a 16-bit card.) But when I tried putting it into an 8-bit slot, and set flags=0x2 to force 8-bit mode, the probe said something like "failed to clear shared memory." John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Nobody ever went broke underestimating the taste of the American public." -- H. L. Mencken To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message