SW is supposed to set it to 1.35V. Sounds like it got dropped somewhere because initially it did.. It was designed this way because when it was designed, the PMIC defaulted to 1.5V. Since the design there is a TPS65217D that was release later that supports the 1.35V initial setting.
Yep, I meant to do that and Yes it is OK, however I prefer the SW folks fix UBoot, if it isn't too much trouble. Gerald On Fri, Sep 5, 2014 at 12:36 AM, <ja...@acs4design.com> wrote: > > Hello, > I've been working to create an industrial temperature derivative of the > BBB(BeagleBoneBlack). In doing so I've noticed that the DDR3 SDRAM part > numbers that are used are DDR3L or 1.35V parts. However, the design uses > the TPS65217C device which automatically sets the DDR3 voltage to 1.5 volts > upon power up. After going through the Uboot source, I found that software > does not change the DCDC1 from it's default value of 1.5V. > > I believe the datasheet for the Micron part says that even though it > supports DDR3L 1.35V mode, it can also run at 1.5V range and will be in > DDR3 mode. > > Was this by design? Mostly I'm just looking for a "Yep, we meant to do > that and it's A-OK" > > ========================== > > This e-mail, including any attachments, is intended for the exclusive use > of the person(s) to which it is addressed and may contain proprietary, > confidential and/or privileged information. If the reader of this e-mail is > not the intended recipient or his or her authorized agent, any review, use, > printing, copying, disclosure, dissemination or distribution of this e-mail > is strictly prohibited. If you think that you have received the e-mail in > error, please notify the sender immediately by return e-mail, delete this > communication and destroy all copies. > > ========================== > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
