From: Wolfgang Denk <wd@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [RFC] Review of U-Boot timer API
Date: Wed, 25 May 2011 07:28:36 +0200 [thread overview]
Message-ID: <20110525052836.11A30CF5DBF@gemini.denx.de> (raw)
In-Reply-To: <4DDC6F46.4090809@comcast.net>
Dear "J. William Campbell",
In message <4DDC6F46.4090809@comcast.net> you wrote:
>
> Well, it is not quite that simple. The "accuracy" of the 1 ms
> interrupt rate is controlled in all cases I know about by the resolution
> of the programmable divider used to produce it. It appears that the x86
I mentioned a couple of times before that accuracy has never been a
design criterion. Please also keep in mind that there are areas in
the code where we block interrupts, and we make zero efforts to detect
or compensate for this in the timer code. This simply is not
important. We are not talking about ppm here, we are talking about
somting that is just good enough for what it is being used, and that
allows easily for +/- 10% tolerances.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"We don't care. We don't have to. We're the Phone Company."
next prev parent reply other threads:[~2011-05-25 5:28 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-21 12:38 [U-Boot] [RFC] Review of U-Boot timer API Graeme Russ
[not found] ` <4DD7DB64.70605@comcast.net>
2011-05-22 0:06 ` Graeme Russ
2011-05-22 0:43 ` J. William Campbell
2011-05-22 4:26 ` Reinhard Meyer
2011-05-22 6:23 ` Graeme Russ
2011-05-22 7:21 ` J. William Campbell
2011-05-22 7:44 ` Graeme Russ
2011-05-22 8:15 ` Reinhard Meyer
2011-05-23 0:02 ` Graeme Russ
2011-05-23 0:20 ` J. William Campbell
2011-05-23 0:14 ` J. William Campbell
2011-05-23 1:00 ` Graeme Russ
[not found] ` <4DD9B608.7080307@comcast.net>
2011-05-23 1:42 ` Graeme Russ
2011-05-23 5:02 ` J. William Campbell
2011-05-23 5:25 ` Graeme Russ
2011-05-23 6:29 ` Albert ARIBAUD
2011-05-23 10:53 ` Graeme Russ
2011-05-23 16:22 ` J. William Campbell
2011-05-23 12:09 ` Wolfgang Denk
2011-05-23 12:29 ` Graeme Russ
2011-05-23 13:19 ` Wolfgang Denk
2011-05-23 17:30 ` J. William Campbell
2011-05-23 18:24 ` Albert ARIBAUD
2011-05-23 19:18 ` Wolfgang Denk
2011-05-23 18:27 ` J. William Campbell
2011-05-23 19:33 ` Wolfgang Denk
2011-05-23 20:26 ` J. William Campbell
2011-05-23 21:51 ` Wolfgang Denk
2011-05-23 20:48 ` Graeme Russ
2011-05-23 3:26 ` Reinhard Meyer
2011-05-23 5:20 ` J. William Campbell
2011-05-22 6:57 ` J. William Campbell
2011-05-23 12:13 ` Wolfgang Denk
2011-05-24 3:42 ` Mike Frysinger
2011-05-24 4:07 ` Graeme Russ
2011-05-24 4:24 ` Mike Frysinger
2011-05-24 4:35 ` Graeme Russ
2011-05-24 5:31 ` Reinhard Meyer
2011-05-24 5:43 ` Graeme Russ
2011-05-24 6:11 ` Albert ARIBAUD
2011-05-24 7:10 ` Graeme Russ
2011-05-24 14:15 ` Wolfgang Denk
2011-05-24 14:12 ` Wolfgang Denk
2011-05-24 15:23 ` J. William Campbell
2011-05-24 19:09 ` Wolfgang Denk
2011-05-24 13:29 ` Scott McNutt
2011-05-24 14:19 ` Wolfgang Denk
2011-05-24 16:51 ` Graeme Russ
2011-05-24 18:59 ` J. William Campbell
2011-05-24 19:31 ` Wolfgang Denk
2011-05-24 19:19 ` Wolfgang Denk
2011-05-24 22:32 ` J. William Campbell
2011-05-25 5:17 ` Wolfgang Denk
2011-05-25 16:50 ` J. William Campbell
2011-05-25 19:56 ` Wolfgang Denk
2011-05-25 0:17 ` Graeme Russ
2011-05-25 2:53 ` J. William Campbell
2011-05-25 3:21 ` Graeme Russ
2011-05-25 5:28 ` Wolfgang Denk [this message]
2011-05-25 6:06 ` Graeme Russ
2011-05-25 8:08 ` Wolfgang Denk
2011-05-25 8:38 ` Graeme Russ
2011-05-25 11:37 ` Wolfgang Denk
2011-05-25 11:52 ` Graeme Russ
2011-05-25 12:26 ` Wolfgang Denk
2011-05-25 12:42 ` Graeme Russ
2011-05-25 12:59 ` Wolfgang Denk
2011-05-25 13:14 ` Graeme Russ
2011-05-25 13:38 ` Wolfgang Denk
2011-05-25 21:11 ` Graeme Russ
2011-05-25 21:16 ` Wolfgang Denk
2011-05-25 23:13 ` Graeme Russ
2011-05-26 0:15 ` J. William Campbell
2011-05-26 0:33 ` Graeme Russ
2011-05-26 4:19 ` Reinhard Meyer
2011-05-26 4:40 ` Graeme Russ
2011-05-26 5:03 ` J. William Campbell
2011-05-26 5:16 ` Wolfgang Denk
2011-05-26 5:25 ` Graeme Russ
2011-05-26 5:55 ` Albert ARIBAUD
2011-05-26 6:18 ` Graeme Russ
2011-05-26 6:36 ` Reinhard Meyer
2011-05-26 8:48 ` Wolfgang Denk
2011-05-26 9:02 ` Graeme Russ
2011-05-26 4:54 ` J. William Campbell
2011-05-25 5:25 ` Wolfgang Denk
2011-05-25 6:02 ` Graeme Russ
2011-05-25 8:06 ` Wolfgang Denk
2011-05-25 8:26 ` Graeme Russ
2011-05-25 11:32 ` Wolfgang Denk
2011-05-25 11:53 ` Graeme Russ
2011-05-25 12:27 ` Wolfgang Denk
2011-05-25 12:36 ` Scott McNutt
2011-05-25 12:43 ` Graeme Russ
2011-05-25 13:08 ` Scott McNutt
2011-05-25 13:16 ` Graeme Russ
2011-05-25 13:46 ` Scott McNutt
2011-05-25 14:21 ` Graeme Russ
2011-05-25 19:46 ` Wolfgang Denk
2011-05-25 20:40 ` J. William Campbell
2011-05-25 20:48 ` Wolfgang Denk
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