AM5718: Configuring remoteproc to save trace0 to disk

Fredrik Wigert

Part Number: AM5718

Hi,

What is best practice when logging from e.g. IPU1 to permanent storage when using SYS/BIOS and linux wit remoteproc?
Copying trace0 at intervals does not seem like a good approach, there must be a better solution to this problem.

Out bld-file contains:

    TRACE_BUF: {
        name: "TRACE_BUF",
        base: 0x9F000000,
        len:  0x00060000,
        space: "data",
        access: "RW"
    },

I don't quite understand where this trace buffer is configured on linux side. The device tree does not mention 0x9F00 0000 anywhere.

Is it expected behavior that tail -f /sys/kernel/debug/remotepcor/remoteproc0/trace0 stops after rollover of the ring buffer, or does this indicate some misconfiguration on our side?

Best regards,

Fredrik Wigert

over 4 years ago

0 Fredrik Wigert over 4 years ago

Intellectual 310 points

10 days without first-line response? Something related to the major upgrade of E2E?

Best regards,

Fredrik

0 Hemant Hariyani over 4 years ago in reply to Fredrik Wigert

TI__Expert 8385 points

Fredrik,

Apologies for the delayed response and thank you for the note. We will get back to you on this ticket.

Regards

Hemant

0 Fredrik Wigert over 4 years ago in reply to Hemant Hariyani

Intellectual 310 points

Please do!

Best regards,

Fredrik

0 Stanley Liu over 4 years ago in reply to Fredrik Wigert

TI__Guru 50045 points

Hi,

Trace buffer in IPC is used as a circular buffer.

In Ipu1.cfg, you can find ".tracebuf" is assigned to TRACE_BUF.

In SysMin.xdt, "ti_trace_SysMin_Module_State_0_outbuf__A" is assigned to ".tracebuf".

And, finally, in rsc_table.h, TRACEBUFADDR is assigned to "ti_trace_SysMin_Module_State_0_outbuf__A" so it is 0x9F000000.

This will be populated in the resource table as one of the entries by IPU1.

In IPC SysMin.c, it will write trace from IPU1 to this location.

On Linux side, remoteproc will read this resource table and identify the entry for trace buffer. remoteproc will retrieve trace from IPU1 at this location.

Regards,
Stanley

0 Fredrik Wigert over 4 years ago in reply to Stanley Liu

Intellectual 310 points

Thank you for that explanation.

My question remains: what is best practice for storing this circular buffer to file in Linux?

0 Karthik Ramanan over 4 years ago in reply to Fredrik Wigert

TI__Guru** 113810 points

Frank,

We do not have a solution that readily does this, however if you need one then you need to build a user space application that periodically reads this circular buffer, keep track of the last read point/timestamp and then logs it into the file.

Regards

Karthik

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AM5718: Configuring remoteproc to save trace0 to disk