AM2432: warm reset in watchdog

Hello Moonil,

I am creating an example code that uses the Watchdog timer interrupt example to create a warm reset. If I am not able to respond by the end of the day with the example code then I will give you a timetable for when you can expect the example code.  Can you confirm if you are wanting the watchdog timer to trigger a MAIN warm reset or an MCU warm reset? 

Regards,

Erik

Hello Moonil,

I was not able to write a code example today but a SW generated MAIN Warm Reset is done by writing 0b0110 to bits 0-3 of the Reset Control MMR. If you are able to create an interrupt based on the watch dog timer successfully, then you should be able to add to the interrupt service routine the ability to have a SW generated warm reset. It is important to note that the Reset Control MMR can't be written to unless the Partition 6 key are written to the lock 0 and 1 registers.  Hopefully this information can help you until I can provide a code example.  

Regards,

Erik

Hi Erik,

Thanks for your kind explanation.

while waiting for your example, I tested simply calling "Sciclient_pmDeviceReset(0xFFFFFFFFU);" in the watchdog timeout interrupt routine. I was able to see SBL was reloaded in the log when this function was called, which means the system was restarted. is it correct?

Please let me know your opinion about using "Sciclient_pmDeviceReset(0xFFFFFFFFU);". I am also looking forward to your example code.

Regards,

Moonil

Hi Erik,

This "Sciclient_pmDeviceReset(0xFFFFFFFFU);" is working from watchdog ISR on EVM. So, I think we can use this approach on the real target board we are designing. I just wonder if there is any dependency on the H/W part. In case, can I ask you whether we have to consider any H/W reset logic for this reset api?

Regards,

Moonil

Hello Moonil

When Sciclient_pmDeviceReset() is called, the System firmware issues a Warm Reset to the MAIN domain by writing to the MAIN domain CTRLMMR_RST_CTRL Register.  All modules in the MAIN domain are reset except for reset isolated modules and MAIN domain CTRLMMR register bits which are only reset by a MAIN Power-on Reset.

After the Warm Reset is de-assterted, the device will boot-up. During the device boot-up, the R5FSS will read the reset status and MCU active magic word registers and reconfigure the MCU domain/M4FSS processor accordingly. 

If there is a need in your application for the MAIN domain Warm Reset signal as an output from the AM2434, use RESETSTATz which is the MAIN Domain warm reset status output.

Does this answer your question?

Regards,

Erik

Hi Erik,

"reset isolated modules" seems to be complicated to me yet.

What will be "reset isolated module of MAIN domain when we use "Sciclient_pmDeviceReset()"? Does it mean all of MCU domain?

I would appreciate it if you share your knowledge on this.

Regards,

Moonil