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I am trying to enable the PRU module on my BeagleBone Black, but I came across two errors. The first one, is when I am trying to activate it:

echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.9/slots

and I get this error:

-sh: echo: write error: No such file or directory

And the second one comes up when I try to run a simple example, like this:

./PRU_memAccessPRUDataRam

with this error:

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

Ho you have any ideea on how can I resolve this two issues? Thank you!

andrussk
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1 Answers1

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Re first question: check whether your file system has /sys/devices/bone_capemgr.9 or /sys/devices/bone_capemgr.8. Many use the command: >sudo echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.*/slots, so it doesn't matter; note also the need for sudo unless you have previously done a sudo su or have logged in as root (not normally recommended).

Re second question: it may be related to first problem. Also, see: http://www.element14.com/community/community/knode/single-board_computers/next-gen_beaglebone/blog/2013/05/22/bbb--working-with-the-pru-icssprussv2. As explained in Step 1), do an >lsmod to see if pru is enabled. If not, you can do a >modprobe uio_pruss or better, change the device tree loaded at bootup (am335x-boneblack.dtb) to have the pru parameter status = "disabled" changed to status = "okay". The link above, authored by Shabaz, is the most useful and understandable link I have found in about a year (on and off) of working with the BBB; it's well worth going through everything there as a tutorial.

bit_pusher
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  • Thank you so much for your comment. I went to the folder /sys/devices/bone_capemgr.8/ and there is the file called slots, so everything is ok so far. I want to mention that my BB doesn't include the command sudo (I am logged as root --by the way, why did you said it isn't recommended to log in as root?) Then I ran the command `echo BB-BONE-PRU-02 >/sys/devices/bone_capemgr.*/slots` again, still got the same error. Secondly, when I type lsmod, is shows nothing about the PRU module. I also did ` >modprobe uio_pruss`, still no change. I will definitely follow the steps on that site. – andrussk Mar 22 '14 at 21:35