From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Thu, 16 Jan 2014 17:08:30 +0100 Subject: [U-Boot] [PATCH] mx6: Revert "mx6: soc: Disable VDDPU regulator" In-Reply-To: References: <1389877049-17615-1-git-send-email-fabio.estevam@freescale.com> <52D7D95F.8040306@denx.de> Message-ID: <52D803FE.3060607@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 Hi Fabio, On 16/01/2014 17:01, Fabio Estevam wrote: > On Thu, Jan 16, 2014 at 1:50 PM, Otavio Salvador > wrote: > >>> It worked for you probably because you used the ldo bypass mode. >> >> >> Yes; I did the bypass mode. > > We currently don't do LDO bypass mode in mainline U-boot. We do it in > FSL U-boot. > > With LDO bypass, lower VDDARM and VDDSOC voltages can be supplied as > per the mx6 datasheet. > > I just measured with the scope and the VDDARM/SOC voltages supplied by > the 3.10 FSL kernel are below the minimum for the LDO enabled case. So > setting LDO bypass in U-boot 'fixes' the issue. > > We can implement LDO bypass after 2014.01 is out, but for this release > let's just revert the VDDPU disable patch. > > Do you agree? > +1 Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de =====================================================================