On Sun, Oct 19, 2014 at 5:36 PM, Peter Gregory <talkto...@gmail.com> wrote: > I've been googling and watching device tree tutorials... all targeted at 3.8 > kernel. > This is great for learning the basics, but I have 3.14 kernel: Linux > beaglebone 3.14.19-ti-r30 #1 SMP PREEMPT Mon Oct 13 20:34:06 UTC 2014 armv7l > GNU/Linux > From what I can find, the friendly device tree tools haven't been ported to > 3.14 yet. > The best way to work with the device tree is to decompile your existing dtb > (I have a 4D LCD display, so I've decompiled the dub for it below) > > #dtc -I dtb -O dts /boot/dtbs/3.14.19-ti-r30/am335x-boneblack-4dcape-43t.dtb >> am335x-boneblack-4dcape-43t.dts > > My goal is to set up the following changes for a A/D light sensor, RGB PWM > LED driver, 2 stepper motors with 2 zero crossing sensors (switches) > > ANALOG P9-39 AIN0 Light Sensor A/D > OUT P8-19 gpio0[22] 22 0x820 EHRPWM2A RED LED PWM > OUT P8-13 pgio0[23] 23 0x824 EHRPWM2B GREEN LED PWM > OUT P9-14 gpio1[18] 50 0x848 EHRPWM1A BLUE LED PWM > IN P8-14 gpio0[26] 26 0x828 GPIO0_26 Sensor 1 Zero Crossing > IN P8-17 gpio0[27] 27 0x82c GPIO0_27 Sensor 2 Zero Crossing > OUT P8-12 gpio1[12] 44 0x830 GPIO1_12 Stepper A1 > OUT P8-11 gpio1[13] 45 0x834 GPIO1_13 Stepper B1 > OUT P8-16 gpio1[14] 46 0x838 GPIO1_14 Stepper C1 > OUT P8-15 gpio1[15] 47 0x83c GPIO1_15 Stepper D1 > OUT P9-15 gpio1[16] 48 0x840 GPIO1_16 Stepper A2 > OUT P9-23 gpio1[17] 49 0x844 GPIO1_17 Stepper B2 > OUT P9-12 gpio1[28] 60 0x878 GPIO1_28 Stepper C2 > OUT P8-26 gpio1[29] 61 0x87c GPIO1_29 Stepper D2 > > The decompiled DTS is pretty confusing. I'm not sure what sections to > change to tie all the pieces together. > > Is there a tutorial somewhere to describe how to do this for kernel 3.14? >
Take a look at: https://github.com/RobertCNelson/dtb-rebuilder/tree/3.14-ti Specifically: Main dtb: https://github.com/RobertCNelson/dtb-rebuilder/blob/3.14-ti/src/arm/am335x-bone-4dcape-43t.dts Main include: https://github.com/RobertCNelson/dtb-rebuilder/blob/3.14-ti/src/arm/am335x-bone-4dcape-43t.dtsi Direction are here: http://elinux.org/Beagleboard:Capes_3.8_to_3.14#Custom_dtb 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.
