Hello Joshua, Not sure if you'll see this but here goes.
You can modify the base dtb file at /boot/dtbs/3.8.XX-boneXX/am335x-boneblack.dtb by converting to dts, modifying, and converting back. I followed the guide here, specifically "What is the device tree?" and step 1:http://www.element14.com/community/community/designcenter/single-board-computers/next-gen_beaglebone/blog/2013/05/22/bbb--working-with-the-pru-icssprussv2 cd /boot/dtbs/3.8.13-bone70/ # navigate to dtb directory, may have to change version numbers cp am335x-boneblack.dtb am335x-boneblack.dtb_orig # create a backup of the dtb incase anything goes wrong dtc -I dtb -O dts am335x-boneblack.dtb > am335x-boneblack.dts_noled # convert dtb file to dts (human readable) nano am335x-boneblack.dts_noled # open the file for editing with your favorite editor Search for "led0". Should be line no. ~946 946 led0 { 947 label = "beaglebone:green:usr0"; 948 gpios = <0x5 0x15 0x0>; 949 linux,default-trigger = "heartbeat"; 950 default-state = "off"; 951 }; 952 953 led1 { 954 label = "beaglebone:green:usr1"; 955 gpios = <0x5 0x16 0x0>; 956 linux,default-trigger = "mmc0"; 957 default-state = "off"; 958 }; 959 960 led2 { 961 label = "beaglebone:green:usr2"; 962 gpios = <0x5 0x17 0x0>; 963 linux,default-trigger = "cpu0"; 964 default-state = "off"; 965 }; 966 967 led3 { 968 label = "beaglebone:green:usr3"; 969 gpios = <0x5 0x18 0x0>; 970 default-state = "off"; 971 linux,default-trigger = "mmc1"; 972 }; All you have to do is change this line in led0 linux,default-trigger = "heartbeat"; to linux,default-trigger = "none"; You can also repeat for leds 1,2, and 3 if desired. Now just convert the dts back to dtb: dtc -I dts -O dtb am335x-boneblack.dts_noled > am335x-boneblack.dtb_noled cp am335x-boneblack.dtb_noled am335x-boneblack.dtb and reboot! Your leds should now be disabled. If anything goes wrong you can always start over with your original backup copy. On Wednesday, June 10, 2015 at 9:18:01 AM UTC-4, [email protected] wrote: > > HI Forum, > > I am attempting to create a device over lay for BBB "Linux beaglebone > 3.8.13-bone70" that will disable the linux heartbeat LED. > > I am interested to do this primary as a learning process for device tree, > but I plan to use the BBB in a room where I don't want a LED to flash. > > I followed the guide at http://elinux.org/BeagleBone_and_the_3.8_Kernel. > > dtc -O dtb -o BBB-LEDS.dtbo -b 0 -@ BBB-LEDS-00A0.dts > > sudo cp BBB-LEDS.dtbo /lib/firmware/ > > sudo sh -c "echo BBB-LEDS > /sys/devices/bone_capemgr.9/slots" > > However the LED continues to flash. > > Could someone point me how to get the overlay to work? > > Thanks > > Joshua > > /dts-v1/; > /plugin/; > / > { > compatible = "ti,beaglebone", "ti,beaglebone-black"; > part-number = "BBB-LEDS"; > version = "00A0"; > > fragment@0 > { > target = <&am33xx_pinmux>; > __overlay__ > { > userled_pins: pinmux_userled_pins { > pinctrl-single,pins = < > 0x54 0x7 /* gpmc_a5.gpio1_21, OUTPUT | MODE7 */ > >; > }; > }; > }; > > fragment@1 > { > target = <&ocp>; > __overlay__ > { > gpio-leds { > compatible = "gpio-leds"; > pinctrl-names = "default"; > pinctrl-0 = <&userled_pins>; > led0 { > label = "beaglebone:green:usr0"; > gpios = <&gpio2 21 0>; > linux,default-trigger = "none"; > default-state = "off"; > }; > }; > }; > }; > }; > -- 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]. For more options, visit https://groups.google.com/d/optout.
