From: "Eric N. Johnson (ACD)" <ejohnson@acdstar.com>
To: linuxppc-embedded@ozlabs.org
Subject: New MPC5200 Eratta/ATA Bugs
Date: Mon, 25 Apr 2005 14:22:56 -0500 [thread overview]
Message-ID: <6.2.1.2.1.20050425130606.030aa288@mail.int.acdstar.com> (raw)
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
next reply other threads:[~2005-04-25 19:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-25 19:22 Eric N. Johnson (ACD) [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-04-25 19:35 New MPC5200 Eratta/ATA Bugs Stephen Warren
[not found] ` <DBFABB80F7FD3143A911F9E6CFD477B00688411F@hqemmail02.nvidia .com>
2005-04-25 22:00 ` Eric N. Johnson (ACD)
2005-04-25 22:13 Stephen Warren
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