From: Ralf Baechle <ralf@linux-mips.org>
To: Pete Popov <ppopov@embeddedalley.com>
Cc: Clem Taylor <clem.taylor@gmail.com>, linux-mips@linux-mips.org
Subject: Re: mdelay() from board_setup() [is default value for loops_per_jiffy way off?]
Date: Wed, 20 Apr 2005 19:07:20 +0100 [thread overview]
Message-ID: <20050420180720.GK5212@linux-mips.org> (raw)
In-Reply-To: <42669862.7000405@embeddedalley.com>
On Wed, Apr 20, 2005 at 10:58:58AM -0700, Pete Popov wrote:
> It's too early in board_setup() to use the standard delay routines. You
> can't use those until after calibrate_delay() runs. To do precise delays in
> board_setup, you'll have to do something yourself where you read the cp0
> timer periodically and wait a certain amount of time.
And make sure not to be trapped by wrap-arounds of that counter. Also it
doesn't count the same speed on all processors ...
Ralf
prev parent reply other threads:[~2005-04-20 18:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-20 17:50 mdelay() from board_setup() [is default value for loops_per_jiffy way off?] Clem Taylor
2005-04-20 17:58 ` Pete Popov
2005-04-20 18:07 ` Ralf Baechle [this message]
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