From: Wolfgang Denk <wd@denx.de>
To: "John W. Linville" <linville@lvl7.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: Linux 2.4.17 bug, mmap of /dev/mem
Date: Tue, 26 Feb 2002 16:18:05 +0100 [thread overview]
Message-ID: <20020226151810.2095D109E3@denx.denx.de> (raw)
In-Reply-To: Your message of "Tue, 26 Feb 2002 09:43:58 EST." <3C7B9F2E.40BC7C46@lvl7.com>
John,
in message <3C7B9F2E.40BC7C46@lvl7.com> you wrote:
>
> I've asked our hardware guys to take a look at the settings for the UPM
> we are using to control SDRAM. Do you think we are on the right track?
> Can you provide any guidance?
Please be aware that UPM settings alone are NOT sufficient for a
correct initialization of most SDRAM chips. Check with the
documentation for your SDRAM chips, and follow the initialization
sequence TO THE LETTER. Pay special attention to minimum and maximum
delays, required dummy accesses, etc.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
A committee is a life form with six or more legs and no brain.
-- Lazarus Long, "Time Enough For Love"
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-02-26 15:18 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-26 3:15 Linux 2.4.17 bug, mmap of /dev/mem David Ashley
2002-02-26 3:50 ` Dan Malek
2002-02-26 14:43 ` John W. Linville
2002-02-26 15:18 ` Wolfgang Denk [this message]
2002-02-26 17:06 ` Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2002-02-27 21:48 David Ashley
2002-02-27 22:05 ` Wolfgang Grandegger
2002-02-27 21:36 David Ashley
2002-02-27 21:04 David Ashley
2002-02-27 21:06 ` Dan Malek
2002-02-26 20:17 David Ashley
2002-02-26 16:00 David Ashley
2002-02-26 0:36 David Ashley
2002-02-26 0:18 David Ashley
2002-02-26 0:06 David Ashley
2002-02-25 23:43 David Ashley
[not found] <3C7AC345.301@embeddededge.com>
2002-02-25 23:26 ` Wolfgang Denk
2002-02-25 22:29 David Ashley
2002-02-25 22:41 ` Wolfgang Denk
2002-02-26 0:57 ` Greg Griffes
2002-02-26 1:34 ` Dan Malek
2002-02-25 20:27 David Ashley
2002-02-25 20:54 ` Dan Malek
2002-02-25 21:06 ` Dan Malek
2002-02-25 22:36 ` Wolfgang Denk
2002-02-25 18:16 David Ashley
2002-02-25 18:51 ` Dan Malek
2002-02-20 15:54 David Ashley
2002-02-15 7:17 Goddeeris Frederic
2002-02-14 17:06 David Ashley
2002-02-14 9:22 Goddeeris Frederic
2002-02-12 0:36 David Ashley
2002-02-08 16:07 David Ashley
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