On 9/11/14, 12:06 PM, "Robert Nelson" <robertcnel...@gmail.com> wrote:
>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=0739 >>>e6021a21e71d7d0f5c840b793ce7fdf98fae;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/r >>>ecipes-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/r >>>ecipes-bsp/u-boot/u-boot-denx/0004-beaglebone-HACK-raise-USB-current-lim >>>it.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? Probably the best place is L1 or R6 which is on the bottom of the board close to the 5V connector Regards, John > >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. -- 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.
