Hi, Are you sure it is the driver and not the PRU firmware?
Remoteproc host driver will load the PRU memories with contents from the ELF file. If you have declared your shared buffer as "static char mybuffer[1024]", then the compiler will allocate 1024 bytes into the BSS section, and the PRU firmware init (CRT library) will set it to zero on startup. You may try putting the array into ".noinit" section. Another thing to try is declaring "static char *mybuffer = (char *)0x1000;", and ensuring that linker will not put any variables into the 12KB Shared DMEM. Regards, Dimitar On Saturday, January 20, 2018 at 12:47:09 PM UTC+2, Maxim Oberkoch wrote: > > Hi folks, > > right now I am trying to get the the PRU with the remoteproc-driver run. > It ist working quite well, but there is one Problem which I dont now how to > solve it. > > I am trying to use the shared Memory between the ARM and PRU. 4a310000 > startig adress. My Problem is that in my application I want to write data > to the shared memory and afterward start the PRU-Core and read put the > data. I am writing with a c-Programm with mmap. It works good and I can > read out the data after I wrote it to the RAM. I am using the devmem2 -tool > from Derick´s Exploring Beaglebone Book. > > No my main problem. After I wrote my data to the shared RAM and start the > PRU-Core (changing the state of the remoteproc-driver) all my data is gone > and in the shared Memory just zeros exist. My question is, why is the > driver writing just zeros to the shared memory when starting the PRU-Core. > And is the any possibility to avoid this process of initilaizing all the > shared memory? > > Do you have any ideas? Why and how this happens? > > > Best Wishes > > Maxim > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/397f8013-3d91-4e06-829c-a14789c5b712%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
