From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Thu, 14 Jul 2011 10:30:11 +0200 Subject: [U-Boot] [PATCH] ARM: MX51: PLL errata workaround In-Reply-To: <1310627513-17461-1-git-send-email-david@protonic.nl> References: <1310627513-17461-1-git-send-email-david@protonic.nl> Message-ID: <4E1EA913.107@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 Hi David, do you have now also an official Errata number from Freescale to be added to your documentation ? Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: office at denx.de =====================================================================