RTOS/AM6548: TI-RTOS error message regarding dmtimer in TI-RTOS example applications

Dominic,

Is it possible for you to provide the test project or the binary that you are using where you observe this issue.

Also, I would recommend that you look at one of our driver test projects for R5 and apply the following fix.

var dmtimer = xdc.useModule('ti.sysbios.timers.dmtimer.Timer');
for (var i = 0; i < 4; i++) {
    dmtimer.intFreqs[i].lo = 25000000;
    dmtimer.intFreqs[i].hi = 0;
}

Example:

pdk_am65xx_1_0_3\packages\ti\drv\uart\test\am65xx

I believe the issue is caused due to BIOS enforcing a timer check to ensure that there is no mismatch.

Regards,

Rahul 

PS: As explained here, you can also disable the timer frequency check using the following setting:

https://e2e.ti.com/support/legacy_forums/embedded/tirtos/f/355/t/144526?dmtimer-frequency-mismatch-redux

Hi,

I tried modifying the example project with the fix that you suggested, but that didn't affect the results.

Right now we're using the "Hello Example" from the TI resource explorer classic following the guide in the processor SDK documentation:

http://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/rtos/index_examples_demos.html#arm-cortex-r5

(we followed the guide step by step)

I'll attach an archive with two projects, one that is just the "Hello Example", the other is extended with your fix.

After some more investigation it appears that the problem only occurs when the AM65x has been booted from the SD card with SBL first.

If I boot the processor with the prebuilt SD card image from processor_sdk_rtos_am65xx_5_02_00_10\prebuilt-sdcards\am65xx_idk\sd_card_img and then load the hello example application via the debugger I get the error message about the frequency mismatch.

If I remove the SD card with the prebuilt SD card image, power cycle the board, and use the debugger to load the example application, I don't get the error message.

Our ultimate goal is to have a TI-RTOS application that gets loaded from OSPI via the SBL, so we need to figure out what initialization is necessary to get a working TI-RTOS application.

I figured out that the code is verifying the frequency of MCU_TIMER0 (address 0x40400000). It seems that this timer is not (properly) initialized when the application is run after the SBL. I'm not sure if/where/how the MCU_TIMER0 ought to be initialized.

hello_IDK_SDK_05.02.zip