From owner-freebsd-hackers Sat Dec 14 23:20:33 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id XAA28280 for hackers-outgoing; Sat, 14 Dec 1996 23:20:33 -0800 (PST) Received: from rah.star-gate.com ([204.188.121.18]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id XAA28274 for ; Sat, 14 Dec 1996 23:20:31 -0800 (PST) Received: from rah.star-gate.com (localhost.star-gate.com [127.0.0.1]) by rah.star-gate.com (8.7.6/8.7.3) with ESMTP id XAA00409 for ; Sat, 14 Dec 1996 23:20:09 -0800 (PST) Message-Id: <199612150720.XAA00409@rah.star-gate.com> X-Mailer: exmh version 1.6.9 8/22/96 To: hackers@freebsd.org Subject: PCI 2.1 Byte Enables? Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 14 Dec 1996 23:20:08 -0800 From: Amancio Hasty Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hi, I am writing a device driver for a PCI video capture board, Brooktree Bt848,as part of a dma risc instruction it requires : byte count and 4 bits for PCI byte enables. Can anyone guess what the PCI byte enables are for? Supposedley, the Bt848 is PCI 2.1 compliant. I have the databook for the Bt848 however it does not explain what the PCI byte enables field is for. I will probably contact again Brooktree next week if no one here knows what the field is for. Tnks, Amancio