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PRU-CGT: Sample PRU code not booting.

Vairamani Vellingiri1
Prodigy 130 points
Part Number: PRU-CGT
Other Parts Discussed in Thread: BEAGLEBOARD-X15

Hi 

I'm using Beagleboard-X15 to experiment the PRU feature. At staring i tried the sample code but it was not booting.

1. CCS Build

In Windows 10 Pro, I build the project "PRU_RPMsg_LED0" copied from ti linux sdk "ti-processor-sdk-linux-am57xx-evm-08_02_01_00" and include files from "pru-icss-6.0.1".

Then followed the section "Create & Build the PRU Project" and code builds successfully.  I made the main simple as below

void main(void)
{
    __halt();
}

The software details are

IDE: CCS v12.3.0.00005 

Compiler version: ti_cgt_pru_2.3.3

2. Loading in Remoteproc

I load the firmware("PRU_RPMsg_LED0.out") in path "/lib/firmware/pru" and ran using the below command

echo 'pru/PRU_RPMsg_LED0.out' > /sys/class/remoteproc/remoteproc1/firmware

echo 'start' > /sys/class/remoteproc/remoteproc1/state

But it shows the error 

ubuntu@beagleboard:~$ echo 'start' > /sys/class/remoteproc/remoteproc1/state

[   72.286275] remoteproc remoteproc1: Boot failed: -22

-bash: echo: write error: Invalid argument

The beagleboard-x15 kernel has remoteproc enabled and its version is "Linux  v4.19.94  SMP PREEMPT "

Let me know the suggestion.

  • 0
    TI__Guru** 112775 points

    Hi,

    Please ensure that you are loading the firmware to the correct remoteproc. AM57xx also has IPUs (Cortex-M Cores) and DSP processors.

    Please also check that the remoteproc is in stopped state first.

    cat  /sys/class/remoteproc/remoteproc1/name

    cat  /sys/class/remoteproc/remoteproc1/state

    regards

    Suman

  • 0 in reply to Suman Anna
    Prodigy 130 points

    Hi Suman

    Thanks for the response,

    Im loading the firmware to the correct remote processor as 'remoteproc1' for PRU1 core.

    it gives the error message when i try to stop. 

    root@am57xx-evm:/lib/firmware/pru# echo 'stop' > /sys/class/remoteproc/remoteproc1/state
    -sh: echo: write error: Invalid argument
    root@am57xx-evm:/lib/firmware/pru# cat /sys/class/remoteproc/remoteproc1/firmware
    pru/PRU_RPMsg_LED0.out
    root@am57xx-evm:/lib/firmware/pru# cat /sys/class/remoteproc/remoteproc1/state
    offline

    Let me know if I need to do any setting before loading the firmware.

  • 0 in reply to Vairamani Vellingiri1
    TI__Guru** 112775 points

    Hi,

    Vairamani Vellingiri1 said:
    root@am57xx-evm:/lib/firmware/pru# cat /sys/class/remoteproc/remoteproc1/state
    offline

    The processor is already in Stopped state as reflected by offline, so issuing a 'stop' will return a failure.

    Are you using 4.19 kernel or the latest 5.10 kernel?

    There are kernel dependent changes in the firmwares, so you cannot pick the latest firmware from PRU-ICSS 6.0.1 and use it with 4.19 kernel. 

    Please look through the Release Notes for compatibility information.

    https://git.ti.com/cgit/pru-software-support-package/pru-software-support-package/tree/Release_Notes.txt

    regards

    Suman