On Wed, Apr 4, 2018 at 6:30 AM, Gerald Coley <gcol...@emprodesign.com> wrote: > 1) The TPS65217D came out after the initial design was done. > > > > 2) The DDR3L can run at 1.5V without issue. > > > > 3) The SW can set the voltage to 1.35V after power up.
Side note, while u-boot and the kernel support changing the pmic voltage. We dropped this during 3.14.x or the 3.18.x cycle in the default kernel device-tree, as there is no memory "checker" in u-boot/kernel to verify the "contents" in memory where still "valid" after the down-scaling. (i believe some random corruption was actually seen on a am4x based board, so all am3x/am4x ) So if you do swap in the TPS65217D and want to run it at 1.35 to save power, make sure you patch both u-boot and kernel. The voltage must be set to 1.35 in u-boot SPL during ram init. (and patch the kernel device tree to not set the 1.5v level).. Regards, -- Robert Nelson https://rcn-ee.com/ -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgYJFVfgxTKK-1yZrwOTN8DVgEQVet34CwAmmQ2J%2BDaCw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
