On Thu, Sep 11, 2014 at 1:57 PM, Jason Kridner <jkrid...@gmail.com> wrote: > > > On Thursday, September 11, 2014 10:39:25 AM UTC-4, RobertCNelson wrote: >> >> On Thu, Sep 11, 2014 at 9:23 AM, Tom Rini <tom.r...@gmail.com> wrote: >> > On Friday, September 5, 2014 1:39:04 PM UTC-4, RobertCNelson wrote: >> >> >> >> On Fri, Sep 5, 2014 at 12:32 PM, Gerald Coley <ger...@beagleboard.org> >> >> wrote: >> >> > 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. >> >> >> >> It should be set here: >> >> >> >> >> >> >> >> http://git.denx.de/?p=u-boot.git;a=blob;f=board/ti/am335x/board.c;h=0739e6021a21e71d7d0f5c840b793ce7fdf98fae;hb=HEAD#l275 >> >> >> >> 269 /* >> >> 270 * Increase USB current limit to 1300mA or 1800mA >> >> and >> >> set >> >> 271 * the MPU voltage controller as needed. >> >> 272 */ >> >> 273 if (dpll_mpu_opp100.m == MPUPLL_M_1000) { >> >> 274 usb_cur_lim = >> >> TPS65217_USB_INPUT_CUR_LIMIT_1800MA; >> >> 275 mpu_vdd = TPS65217_DCDC_VOLT_SEL_1325MV; >> >> 276 } else { >> >> 277 usb_cur_lim = >> >> TPS65217_USB_INPUT_CUR_LIMIT_1300MA; >> >> 278 mpu_vdd = TPS65217_DCDC_VOLT_SEL_1275MV; >> >> 279 } >> >> >> >> >> >> But that only happens if you have the "beaglebone black" header in >> >> eeprom: >> >> >> >> 262 /* >> >> 263 * Override what we have detected since we know if >> >> we >> >> have >> >> 264 * a Beaglebone Black it supports 1GHz. >> >> 265 */ >> >> 266 if (board_is_bone_lt(&header)) >> >> >> >> So you'll have to override that check. >> > >> > >> > Note that the question was about DCDC1 and DDR voltage not DCDC2/3 (CORE >> > and >> > MPU) voltage. I don't know what initial bring-up U-Boot was whacking >> > DCDC1 >> > but it never reached the rest of the world so it's more a happy accident >> > that should be corrected (and wouldn't be too hard to do, if anyone out >> > there is looking for a reason to get their feet wet ). >> >> Well, the original v2013.04 patchset can be seen here: >> >> >> https://github.com/beagleboard/meta-beagleboard/tree/master/common-bsp/recipes-bsp/u-boot/u-boot-denx >> >> The only thing that touches the pmic, is this hack: >> >> >> https://github.com/beagleboard/meta-beagleboard/blob/master/common-bsp/recipes-bsp/u-boot/u-boot-denx/0004-beaglebone-HACK-raise-USB-current-limit.patch >> >> I don't have my tps decoder ring, so i'm not sure if that address is >> more then just the usb current setting.. > > > I believe the equivalent hack to set DCDC1 to 1.35V is > > > +/* 0x24 is the address of the PMIC */ > +/* 0x0b is the password register */ > +/* 0x0e is the DEFDCDC1 register */ > +/* 0x73 is the password (register 0x0e ^ 0x7d) */ > +/* 0x12 sets the DCDC1 to 1.35V */ > +/* Sequence must be repeated twice for password protection */ > #define CONFIG_BOOTCOMMAND \ > + "i2c mw 0x24 0x0b 0x73; " \ > + "i2c mw 0x24 0x0e 0x12; " \ > + "i2c mw 0x24 0x0b 0x73; " \ > + "i2c mw 0x24 0x0e 0x12; " \ > > I'm just about to try this out, but don't mind if someone beats me to it. > :-)
Is there an easy to access ddr3_vdd test point? Regards, -- Robert Nelson http://www.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. For more options, visit https://groups.google.com/d/optout.
