From mboxrd@z Thu Jan 1 00:00:00 1970 From: York Sun Date: Wed, 11 Jun 2014 14:31:40 -0700 Subject: [U-Boot] [PATCH][v3] powerpc/t4qds: Add alternate serdes protocols to align with A-007186 In-Reply-To: <1400208753-3021-1-git-send-email-shh.xie@gmail.com> References: <1400208753-3021-1-git-send-email-shh.xie@gmail.com> Message-ID: <5398CABC.3050101@freescale.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 05/15/2014 07:52 PM, shh.xie at gmail.com wrote: > From: Shaohui Xie > > A-007186: SerDes PLL is calibrated at reset. It is possible for jitter to > increase and cause the PLL to unlock when the temperature delta from the > time the PLL is calibrated exceeds +56C/-66C when using X VDD of 1.35 V > (or +70C/-80C when using XnVDD of 1.5 V). No issues are seen with LC > VCO. Only the protocols using Ring VCOs are impacted. > > Workaround: > For all 1.25/2.5/5 GHz protocols, use LC VCO instead of Ring VCO, this need > to use alternate serdes protocols. The alternate option has the same > functionality as the original option; the only difference being LC VCO > rather than Ring VCO. > > Signed-off-by: Shaohui Xie > --- > changes for V3: > update t4_rcw.cfg. > > changes for V2: > refined commit message. > Applied to u-boot-mpc85xx. Sorry for the late notice. York