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. :-) > 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.
