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From: "Autran, Guillaume" <gautran@mrv.com>
To: "'linuxppc-embedded@ozlabs.org'" <linuxppc-embedded@ozlabs.org>,
	"'n_tbinh@yahoo.com'" <n_tbinh@yahoo.com>
Subject: RE: Booting hangs after "Calibrating delay loop..."
Date: Wed, 23 Nov 2005 11:39:05 -0500	[thread overview]
Message-ID: <19EE6EC66973A5408FBE4CB7772F6F0A2105B2@ltnmail.xyplex.com> (raw)

Hi,

I remember there is some race condition before calling set_dec(..) in time.c
Basically, what happens is that the external decrementer is set way before
the interrupt gets enabled. When we get to enable the interrupt, the
decrementer value already reached 0 and wrapped arround (at least in our
case). 
The fix was to comment the line in:
arch/ppc/kernel/time.c:330: set_dec(tb_ticks_per_jiffy);

And move it to:
arch/ppc/syslib/m8xx_setup.c
inside m8xx_calibrate_decr() just before setting up the interrupt for the
decrementer.

In time.c, you may also need to initialize stamp = get_native_tbl(); as this
variable may not have been initialized since you are using an external
decrementer.

Try that...

Guillaume.

             reply	other threads:[~2005-11-23 16:43 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-11-23 16:39 Autran, Guillaume [this message]
2005-11-29  3:20 ` Booting hangs after "Calibrating delay loop..." Nguyen Thanh Binh
  -- strict thread matches above, loose matches on Subject: below --
2005-11-30 21:58 Autran, Guillaume
2005-12-03  2:13 ` Nguyen Thanh Binh
2005-12-03  2:14 ` Nguyen Thanh Binh
2005-11-17 15:04 Jaap de Jong
2005-11-23  9:52 ` Nguyen Thanh Binh
2005-11-17  8:19 Nguyen Thanh Binh

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