prussdrv_open open failed

[vmayoral]

I've been able to compile everything following these steps but i get the following error when trying to run the examples:

./PRU_memAccessPRUDataRam
INFO: Starting PRU_memAccessPRUDataRam example.
prussdrv_open open failed

[olsonse]

Not that this is the (only) problem, but have did you run this as root?

[vmayoral]

@olsonse thanks for following up, yes i did. It's not that.

[olsonse]

can you give me the commit hash that your code is at?

[vmayoral]

Last one 5018f39.

Don't think it matters but I copied the libprussdrv* libs located at am335x_pru_package/pru_sw/app_loader/libto /lib. Otherwise executing:

./PRU_memAccess 
./PRU_memAccessPRUDataRam: error while loading shared libraries: libprussdrv.so: cannot open shared object file: No such file or directory

[vmpn]

Did you enable the PRU?

I use the following command:

echo BB-BONE-PRU-01 > /sys/devices/bone_capemgr.8/slots

[olsonse]

The .so libs were meant currently only for the python wrapper. That could be a problem. But your error you showed with the library not loading is not consistent with the error "prussdrv_open open failed" error you got earlier. Did you upgrade in the mean time, or change how you built the code?

[vmayoral]

@vmpn @olsonse thanks for your support.

The problem was that the PRU was not enabled. echo BB-BONE-PRU-01 > /sys/devices/bone_capemgr.8/slots fixed it.

A simple step-by-step guide of these first steps is available here.

Bests

[andrelutza]

I was trying the same thing and it took me to another problem. When I try to enable the PRU, I get this error:

root@beaglebone:~# echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.8/slots
sh: echo: write error: No such file or directory

Did you come across the same problem? How can I resolv it?
Thank you.

[CoryStewart]

@andrelutze
Sometimes you need to use /sys/devices/bone_capemgr.9.
Do an 'ls' in that dir to see what you have.

[andrelutza]

@CoryStewart
That doesn't seem to be the problem (I have the folder called "bone_capemgr.8"), moreover, autocomplete does its job... Can you give me any other ideas?

[andrelutza]

Also, when I try to run ./PRU_memAccessPRUDataRam , I get this:
prussdrv_open open failed
Any ideas? Thank you.

[Hitheshkaranth]

I was trying the same thing and it took me to another problem. When I try to enable the PRU, I get this error:

root@beaglebone:~# echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.8/slots
sh: echo: write error: No such file or directory

Did you come across the same problem? How can I resolv it?
Thank you.

Replying to this problem --->

• Make sure you add the .dtbo file upon compilation to /lib/firmware
• in SU mode "echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.8/slots"
• if you are using Beaglebone Black then " echo BB-BONE-PRU-01 >/sys/devices/platform/bone_capemgr/slots"
  Thank you