From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.acdstar.com (mail.acdstar.com [209.98.244.9]) by ozlabs.org (Postfix) with ESMTP id 8398367A6B for ; Tue, 26 Apr 2005 05:22:49 +1000 (EST) Received: from zaphod.acdstar.com (zaphod.int.acdstar.com [192.168.2.100]) by mail.acdstar.com (8.13.0/8.13.0) with ESMTP id j3PJQZax002086 for ; Mon, 25 Apr 2005 14:26:35 -0500 Message-Id: <6.2.1.2.1.20050425130606.030aa288@mail.int.acdstar.com> Date: Mon, 25 Apr 2005 14:22:56 -0500 To: linuxppc-embedded@ozlabs.org From: "Eric N. Johnson (ACD)" Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Subject: New MPC5200 Eratta/ATA Bugs List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Freescale just realeased a new version of the eratta (hardware bugs) document for the MPC5200. It was posted last week, and adds some pretty significant problems to the FEC Ethernet and IDE/ATA sections. Specifically, I'm wonder if Eratta ID 485 may be the cause of some of the IDE issues we've been attributing to Bestcomm: "During the concurrent access of ATA DMA READ and PCI or LPC the ATA_ISOLATION signal can be incorrectly driven when ATA is paused." Unfortunately, their proposed workaround isn't appropriate for many cases. They suggest that you not use "ATA_ISOLATION" and connect the ATA device directly to the LP bus without any buffering. This could lead to serious bus integrity issues, especially if the ATA device is connected by a ribbon cable. Eric ------------------------------------ Eric Johnson, Electrical Engineer Advanced Communication Design 7901 12th Avenue South Bloomington, MN 55425 Ph: 952-854-4000 Fax: 952-854-5774