Hello, thank you for the answer and sorry for the late reply, is it possible to disable the driver without recompiling the kernel?
I see there are 4 drivers present for the am335x: kernel/drivers/pwm/pwm-tiecap.ko kernel/drivers/pwm/pwm-tiehrpwm.ko kernel/drivers/regulator/pwm-regulator.ko kernel/drivers/video/backlight/pwm_bl.ko What's the difference between the first two? The folder I assumed to be filled (/sys/class/pwm) when the drivers are enabled is empty. Also: Does the kernel manages the timer and pwm with same driver? Thank you, -l Il giorno venerdì 29 dicembre 2017 15:53:28 UTC+1, RobertCNelson ha scritto: > > On Fri, Dec 29, 2017 at 8:22 AM, Henner Zeller <[email protected] > <javascript:>> wrote: > > On 27 December 2017 at 13:48, Leonardo Romor <[email protected] > <javascript:>> wrote: > >> Hello, > >> > >> could someone explain me why running this code freezes the kernel? > >> > >> https://gist.github.com/lromor/e303c88cfb8a065d411f2ba0bc52324b > > > > Thanks Leonardo to measure and put together this report of this issue > > when using 4.4.91-ti-r137. > > > >> > >> It should turn on the beaglebone TIMER4. > >> I have tested this code on 3.8 kernel and it works. > > > > This currently prevents PWM to work in BeagleG in newer kernels; so it > > would be good to know from some of the people familiar with the > > kernel/GPIO interaction could chime in and explain what is going on > > and if there is a way to work-around it or if the initialization > > should be different altogether. > > Let's see, your mmap'ing a clock that "was" being handled by the > kernel's pwm subsystem, and now the system freezes... > > Well, stop mmap'ing or disable the pwm driver.. > > 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/e93eaf41-49ef-4db1-b7ac-bae099b0dab2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
