Using own leds with default-trigger based on sysfs.

0815

Other Parts Discussed in Thread: AM3352

Hello,

I have adapted (ti-processor-sdk-linux-am335x-evm-02.00.01.07, tisdk_am335x-evm_defconfig) and generated u-boot, dts (based on beagleboneblack), initrd and the kernel for our own am3352 hardware. This platform boots from an other processor using shared ram, so there is no nonvolatile rootfs and I use a ram based fs (also loaded from the other processor) to run an embedded application.

According to other platforms I modified the leds{...} struct in the dts to address the correct gpio pins. The boot is working fine and I got the "initramfs>" prompt with my initrd. When I list the "/sys/firmware/devicetree/base/leds" I got the struct with the data of my dts. Unfortunately there are no entries in "/sys/class/leds" and the default-triggers (e.g. heartbeat) are not working.

The leds are working fine when I use the exported gpio ports via "/sys/class/gpio".
What's missing?

Thank you for help in advance.

-- Peter

over 9 years ago

0 Titusrathinaraj Stalin over 9 years ago

TI__Guru** 116100 points

Dear Peter,
Can you please provide your changes ?
Have you checked the Linux boot logs for leds driver ?

Please make sure that you have enabled the LED driver.

0 0815 over 9 years ago in reply to Titusrathinaraj Stalin

Prodigy 130 points

Dear Titus,

Thank you for your prompt response. Meanwhile I tried to load the leds kernel modules (kernel/drivers/leds/...ko) manualy with modprobe and I could load this modules only with my added "busybox modprobe" and not with the "modprobe" from "sbin" dir, which is a link to "kmod" (Version 18).

--Peter

0 Titusrathinaraj Stalin over 9 years ago in reply to 0815

TI__Guru** 116100 points

As you said, you are using RAM based filesystem, so you may not get the much commands but you can get it some of the commands through busybox only.

0 0815 over 9 years ago in reply to Titusrathinaraj Stalin

Prodigy 130 points

Dear Titus,

with "busybox modprobe" the leds are working fine. My memory limit is the total flash size of 32 MB of the other processor, which contains code for this second cpu (12 MB), uboot (0,5 MB), kernel (3.3 MB) and initrd (5 MB + my app?), but up til now it is sufficient.

Thank you for help.

-- Peter

0 Titusrathinaraj Stalin over 9 years ago in reply to 0815

TI__Guru** 116100 points

Thanks for the updater Peter.
Let us know if any issues.

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Using own leds with default-trigger based on sysfs.