From owner-cvs-src Tue Feb 18 6:35:57 2003 Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3ECC537B401 for ; Tue, 18 Feb 2003 06:35:56 -0800 (PST) Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6792F43F93 for ; Tue, 18 Feb 2003 06:35:55 -0800 (PST) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.12.6/8.12.6) with ESMTP id h1IEZr8I017558 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Tue, 18 Feb 2003 09:35:54 -0500 (EST) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.6/8.9.1) id h1IEZm844697; Tue, 18 Feb 2003 09:35:48 -0500 (EST) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15954.17604.453276.246271@grasshopper.cs.duke.edu> Date: Tue, 18 Feb 2003 09:35:48 -0500 (EST) To: Peter Wemm Cc: Marcel Moolenaar , cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/alpha/alpha machdep.c In-Reply-To: <20030217215943.602032A89E@canning.wemm.org> References: <15953.15467.687489.517344@grasshopper.cs.duke.edu> <20030217215943.602032A89E@canning.wemm.org> X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid Sender: owner-cvs-src@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Peter Wemm writes: > > It depends on the tag declarations. If you tell busdma that the device > can address 64 bit, then it just does. Its up to your driver to deal with > DAC or larger address pointers or whatever. I seem to recall that many Sure. Already do. But we (FreeBSD) don't seem to declare a BUS_SPACE_MAX{ADDR,SIZE}_64BIT yet. > of the ahc family have space in the descriptors for 39 bit addressing. > The ahc driver gives an example of how to configure and use this. Ugh. Talk about off by one. Most alpha chipsets require bit 40 be set when using 64-bit DMA addresses. (the one I'm working on uses bit 49). Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-src" in the body of the message