AM3359: PRU pinmux in device tree

Ozgur Bas

Part Number: AM3359

Hello, our new motor drive project includes tmdxice3359 ref design. We want to configure PRU IOs with dtb files in linux.

The file "Open the /boot/uEnv.txt file" mentioned in octavosystems.com/.../ does not exist in your distributed linux version.

Is there any tutorial or suggestion to follow? Is there any problem if we configure PRU IO s at the beginning of PRU code? Thank you.

root@am335x-evm:/# cd boot

root@am335x-evm:/boot# ls

am335x-bone.dtb am335x-boneblack.dtb am335x-evmsk.dtb am335x-pocketbeagle.dtb am335x-boneblack-iot-cape.dtb am335x-boneblue.dtb am335x-icev2-pru-excl-uio.dtb am335x-sancloud-bbe.dtb am335x-boneblack-pru-adc.dtb am335x-bonegreen-wireless.dtb am335x-icev2-prueth-pps.dtb vmlinux-4.19.59-rt24-g4203cb8c96 am335x-boneblack-prusuart.dtb am335x-bonegreen.dtb am335x-icev2-prueth.dtb zImage am335x-boneblack-wireless.dtb am335x-evm.dtb am335x-icev2.dtb zImage-4.19.59-rt24-g4203cb8c96

root@am335x-evm:/boot# uname -a

Linux am335x-evm 4.19.59-rt24-g4203cb8c96 #1 PREEMPT RT Sun Oct 20 14:07:52 UTC 2019 armv7l GNU/Linux root@am335x-evm:/boot#

over 6 years ago

0 Nick Saulnier over 6 years ago

TI__Guru** 110030 points

Hello Ozgur,

uEnv should hold the uboot environment settings. Please take a look at our create-sdcard documentation for information about creating an out-of-the-box TI Linux SD card. uEnv should be in the boot partition (NOT the larger root filesystem partition). You can also modify uEnv from the uboot terminal. You can find general information about uboot here.

Note that the PRU does not have permissions to modify the pinmux registers. So the ARM core will need to set up the pinmuxing to route PRU GPI/GPO signals out of the AM335x, and then the PRU can initialize those GPO values separately.

Regards,

Nick

0 Ozgur Bas over 6 years ago in reply to Nick Saulnier

Prodigy 70 points

Thank you.

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AM3359: PRU pinmux in device tree