On Tue, Sep 5, 2017 at 11:03 AM, Kasimir <[email protected]> wrote: > I want to use the HDMI outputs to drive external circuit. Required toggle > rate is between 1MHz and 10MHz. > Have BB black. > uname -a > Linux beaglebone 4.4.84-ti-r120 #1 SMP Sun Aug 27 03:11:07 UTC 2017 armv7l > GNU/Linux > cat /etc/debian_version > 9.1 > So I have to use the PRU unit. > I was searching example to have a starting point. > But it sucks already with the first step. > > ll /sys/devices/bone_capemgr* > ls: cannot access '/sys/devices/bone_capemgr*': No such file or directory > > I load the image from here: > http://debian.beagleboard.org/images/bone-debian-9.1-iot-armhf-2017-08-31-4gb.img.xz > > What is my mistake? > Device tree compiler is up to date > device-tree-compiler is already the newest version > (1.4.4-0rcnee3~stretch+20170719). > 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. > > Found a lot of hints to use the 3.8 kernel. Think that one is already some > years old, can't be true. > > Question: How to create the required device tree overlay, because > /sys/devices/bone_capemgr* is not existing?
That was the 3.8.13 location, this changed in 4.1.x+ For that newer image it's using u-boot overlays: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays to disable hdmi follow: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Disable_on-board_devices and http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_PRU_Options if you have any problem run: sudo /opt/scripts/tools/version.sh and we can debug what wrong.. 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgf3Lf9U8tBqZR3-FA5%3DSsYAxdbB7Hp3_Y9SyK%2B0rXcHw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
