MSGQ queue full causes kernel panic on the ARM side

Charles Ung

Other Parts Discussed in Thread: OMAPL138, OMAP-L138

We are using DSPLINK, specifically MSGQ, for communication between the ARM and the DSP on the OMAPL138. On the DSP side, we have implemented the logic so that if the queue is full, we will wait a bit before trying to write to it again. However, we keep running into a problem that if we ever get to the point that the pipe is full, the ARM side that is running Linux will kernel panic. Has anyone experienced this using the DSPLINK sample driver? Any idea what may have gone wrong?

Thanks,

Charles

over 12 years ago

0 Raja over 12 years ago

TI__Guru* 81335 points

MSGQ can be used for both intra-processor communication (process to process) and inter-processor communication (ARM + DSP) as is the case when using DSPLink.

You may also find some useful info here:
http://processors.wiki.ti.com/index.php/DSPLink_FAQs

http://processors.wiki.ti.com/index.php/DSPLink_FAQs#MSGQ_questions

http://processors.wiki.ti.com/index.php/DSPLink_FAQs#What_is_the_difference_between_DSPLink_MSGQ_and_DSP.2FBIOS_MSGQ.3F

There are also various examples in both the DSPLink product and the DSP/BIOS examples that should should help you get started.

If you are using the OMAP-L138 DVSDK kit there is an audio example (audio SOC) that uses MSGQ to pass data between processors using DSPLink. You can find more detailed info on that application:

http://processors.wiki.ti.com/index.php/Audio_Soc_example

The MSGQ module is described in the BIOS User Guide and API reference.

API Reference: http://www.ti.com/lit/ug/spru403s/spru403s.pdf

BIOS UG: http://www.ti.com/lit/ug/spru303b/spru303b.pdf

Which version of BIOS are you using?

0 Charles Ung over 12 years ago in reply to Raja

Prodigy 180 points

We are using DSP/BIOS v5.41.13.42. For the Linux side, we are using a modified version 2.6.34-rc1 that came with the MityDSP modules.

We were using the TI example to get thing started and we simply made minor changes to make it do what we need but we are seeing this problem. We had gone through most of the examples and doumentation but did not recall seeing any mentioning of this.

Processors

Processors forum

MSGQ queue full causes kernel panic on the ARM side