From owner-freebsd-questions Thu May 31 23:38: 4 2001 Delivered-To: freebsd-questions@freebsd.org Received: from opus.sandiegoca.ncr.com (tan7.ncr.com [192.127.94.7]) by hub.freebsd.org (Postfix) with ESMTP id 1D33B37B423 for ; Thu, 31 May 2001 23:38:02 -0700 (PDT) (envelope-from chuckr@opus.sandiegoca.ncr.com) Received: from localhost (chuckr@localhost) by opus.sandiegoca.ncr.com (8.11.1/8.11.1) with ESMTP id f516eWu44157; Thu, 31 May 2001 23:40:32 -0700 (PDT) (envelope-from chuckr@opus.sandiegoca.ncr.com) Date: Thu, 31 May 2001 23:40:32 -0700 (PDT) From: Chuck Rouillard To: Kyle Rollin Cc: "David L. Hays, Jr." , Subject: Re: Problem with sound card and lpt port on non-standard IRQs In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 1 Jun 2001, Kyle Rollin wrote: > > > > > ----- > > > Kernel Config file: > > > # Parallel port > > > device ppc0 at isa? port? irq 5 drq 3 > > > device ppbus # Parallel port bus (required) > > > device lpt # Printer > > > > Why do you have a DMA request value for a parallel port device? > > > > Most modern LPT ports (ECP, EPP, etc) require a DMA address. This is for > bi-directional communication with the printer, so the printer can directly > access the spooled pages in memory, etc. Fair enough. I haven't done any parallel port work, but I thought these to be PIO devices. Nevertheless, I don't see any explicit DMA support for the ppc device, at least in 4.3-STABLE (which is all I happen to have here at the moment). > > -Kyle Rollin > klined@orbimus.dhs.org .cr To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message