Part Number: AM2612
Hi all,
In the AM261, we have the reset cause register which can show the reason of last reset. If we choose ROM boot, we can read the different value from this register. But we choose flash boot, we can only read 0X41 from this register, regardless of which way of reset. What maybe cause this phonomenon?
We suspend the SBL clear the register. The below picture is our SBL log:
Regard,
Jenney
Hi Sahana,
i add some information:
1. I just use the SBL example in the SDK: mcu_plus_sdk_am261x_11_01_00_19\examples\drivers\boot\sbl_ospi_nand_multicore_elf
2. This SBL seems disabled warmrst, right? Because i use the SW2 in the Launchpad, the board can't reset.
3. I use the watchdog to warmrst the board. But the board cannot boot from flash. i need use the coldrst(like power on) which can boot board from flash. Is it normal?
4. In the appliction after SBL, i try to read the reset cause. If i choose ROM boot, i can read the different value from this register. But i choose flash boot, i can only read 0X41 from this register, regardless of which way of reset. Also i tried to read it inthe SBL by the API. there also is no change. Maybe i found the wrong register. Could you tell me the address or name of the register(RESET CAUSE).
Regards,
Jenney
Hi Jenney,
This SBL seems disabled warmrst, right? Because i use the SW2 in the Launchpad, the board can't reset.
Yes, this is disabled by default in hardware and wouldn't work unless this register isconfigured:
I use the watchdog to warmrst the board. But the board cannot boot from flash. i need use the coldrst(like power on) which can boot board from flash. Is it normal?
No, this is not expected. Any warm reset should also reset the flash (as shown in the below Rev. A schematic) and should be able to boot from flash. Could you please confirm the revision of AM261-LP board you're using?
In the appliction after SBL, i try to read the reset cause. If i choose ROM boot, i can read the different value from this register. But i choose flash boot, i can only read 0X41 from this register, regardless of which way of reset. Also i tried to read it inthe SBL by the API. there also is no change. Maybe i found the wrong register. Could you tell me the address or name of the register(RESET CAUSE).
This is the register that shows the reset cause:
The default value of this register is 0x41, so it would continue to show this unless it's cleared by writing 0x7 to the CLR register:
Regards,
Sahana
Hi Sahana,
Ok, i will let customer try it again.
Customer found: when using EVM debugging, code run for many time. Suddenly the device has been reset. The project has no configuration about watchdog and HSM.
what reason perhaps does it due to?
Regards,
Jenney
Hi Sahana,
The revision of AM261-LP board as below:
customer used the watchdog to warmrst the board which boot by flash mode. But the board cannot boot from flash. customer need use the coldrst(like power on) which can boot board from flash.
Also customer found the OSPI0_RESET_OUT0 keep low. Customer force this pin high, everything is ok.
Hi Sahana，
Is the reset happening in OSPI Boot mode? Has the customer programmed the HSM RT firmware through the SBL? There is 180sec timeout check from ROM, i.e. HSMRT should be up within 180sec, else HSM will reset the watchdog.
No, customer use the uart mode. They didn't program any HSM firmware. Sometimes it will reset after few minutes, sometimes it happened in 10~20 seconds.
Regards,
Jenney
Jenney,
The revision of AM261-LP board as below:
customer used the watchdog to warmrst the board which boot by flash mode. But the board cannot boot from flash. customer need use the coldrst(like power on) which can boot board from flash.
Please create a separate E2E for separate issues for better tracking and support.
