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PROCESSOR-SDK-AM335X: am335x ethernet-prp problem

Part Number: PROCESSOR-SDK-AM335X

Good day,

I try to up ethernet-prp on custom board, like am33tx-icev2, using SDK am335x-evm-linux-rt-sdk-src-06.03.00.106.

I try to use standart commands from manual, like echo 'am335x-pru0-fw' > /sys/class/remoteproc/remoteproc1/firmware

As a result i receive: operation not permitted.

I use standart u-boot  and standart dtb file (am335x-icev2-prueth.dtb).

Fed.