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From: Clem Taylor <clem.taylor@gmail.com>
To: linux-mips@linux-mips.org
Subject: mdelay() from board_setup() [is default value for loops_per_jiffy way off?]
Date: Wed, 20 Apr 2005 13:50:10 -0400	[thread overview]
Message-ID: <ecb4efd10504201050a00f941@mail.gmail.com> (raw)

Hi,

I'm working on a linux port for a custom Au1550 based board. Inside of
board_setup() I need to wait for some hardware to power up. So, I
called mdelay(), but it seems to wait for far too short a time. It
seems that loops_per_jiffy still has the default value (4096) in
board_setup(), the computed value is more like 245248. So, what is the
proper way to spin wait this early in the startup process? Also, isn't
the default value for loops_per_jiffy off by quite a bit? I'm running
the Au1550 at 492MHz, so that would make the default value good for a
~8MHz processor?

                               --Clem

             reply	other threads:[~2005-04-20 17:50 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-20 17:50 Clem Taylor [this message]
2005-04-20 17:58 ` mdelay() from board_setup() [is default value for loops_per_jiffy way off?] Pete Popov
2005-04-20 18:07   ` Ralf Baechle

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