From: Stefano Babic <sbabic@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] ARM: MX51: PLL errata workaround
Date: Thu, 14 Jul 2011 10:30:11 +0200 [thread overview]
Message-ID: <4E1EA913.107@denx.de> (raw)
In-Reply-To: <1310627513-17461-1-git-send-email-david@protonic.nl>
On 07/14/2011 09:11 AM, David Jander wrote:
> This is a port of the official PLL errata workaround from Freescale to
> mainline u-boot.
> The PLL's in the i.MX51 processor can go out of lock due to a metastable
> condition in an analog flip-flop when used at high frequencies.
> This workaround implements an undocumented feature in the PLL (dither
> mode), which causes the effect of this failure to be much lower (in terms
> of frequency deviation), avoiding system failure, or at least decreasing
> the likelihood of system failure.
>
> Signed-off-by: David Jander <david@protonic.nl>
Hi David,
do you have now also an official Errata number from Freescale to be
added to your documentation ?
Best regards,
Stefano Babic
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next prev parent reply other threads:[~2011-07-14 8:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-14 7:11 [U-Boot] [PATCH] ARM: MX51: PLL errata workaround David Jander
2011-07-14 8:30 ` Stefano Babic [this message]
2011-07-14 10:13 ` David Jander
2011-07-14 10:37 ` Stefano Babic
2011-07-14 10:23 ` David Jander
2011-07-14 10:41 ` Stefano Babic
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