RTOS/AM5728: RPMsg PRU questions

philos

Part Number: AM5728

Tool/software: TI-RTOS

I am using am5728-idk board.On borad System using:ti-processor-sdk-linux-rt-am57xx-evm-04.01.00.06.

I noticed that there is a am572x-idk-uio.dtsi in arch/arm/boot/dts .And I try to modify am572x-idk.dtsi and include it.

After $make dtbs and reboot. I saw /dev/uiox and /sys/class/uio/uiox appeared .That means the uio driver is working with am5728-idk.

Then I try to follow .

but it still turned out with error:prussdrv_open() failed .

Q1:I look at the /sys/class/remoteproc/ ,remotepproc 0~1 is for dsp,and remoteproc2~3 is for ipu. So that means pru can't use uio_driver?

Q2: As the title says,RPMSG_PRU how to access memory through C code? I really need it for my project!!!

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

You should note for the future that RTOS and Linux-RT are two different OS, when you start a new thread.
The software team will respond here.

0 philos over 8 years ago in reply to Biser Gatchev-XID

Intellectual 520 points

Should I open a new thread in Linux-RT?

0 Biser Gatchev-XID over 8 years ago in reply to philos

TI__Guru**** 393215 points

No, response will be posted here. This was just a reminder for future threads.

0 Jason Reeder over 8 years ago in reply to Biser Gatchev-XID

TI__Genius 10440 points

philos,

The TI supported method (while running Linux on the ARM core) to load the PRU cores is the RemoteProc driver and the supported communication between the ARM and PRU is RPMsg: processors.wiki.ti.com/.../PRU-ICSS_Remoteproc_and_RPMsg.

The UIO device tree that you found in the Linux Processor SDK kernel source is only used for a specific PRU Ethernet use case where user space is used to handle the PRU Ethernet. Here is a wiki page describing that specific use case: processors.wiki.ti.com/.../Processor_SDK_Linux_ICSS-EMAC_User_Space

The UIO example that you linked to was written by a community member and cannot be supported here by TI.

In your other thread (e2e.ti.com/.../2392272 it appears like you have RemoteProc and RPMsg being configured correctly. Once the RPMsg channel is created you can use the /dev/rpmsgXX character device to communicate between the ARM and PRU cores. Is there something else that you are missing?

Jason Reeder

Processors

Processors forum

RTOS/AM5728: RPMsg PRU questions