Resetvector catch in iMX8QM

[ranjith_tc]

Hi,

In the iMX8QM, I am trying to do a reset catch.

For this I am setting the EDECR.RCE to 1 and necessary steps to do the warm reset from software( RMR_ELn.RR=1).

The target is gettting reset, but it is not stopping at reset vector.

Do i  need to do anything else to make this happen?

Regards,

ranjith

@‌igorpadykov

[ranjith_tc]

Hi Igor,

I would like to reset the first A53 core and halt it at the reset vector.

For this I am using the RMR_EL2.RR bit.and for catching at the reset, I am setting EDECR.RCE bit.

The core is getting reset and it starts running. So when i check thestatus of EDECR, it has been cleared.

What kind of reset it do when RR is set? A warm reset or cold reset? If it is a warm reset the register should not clear isnt it?

Is ARMv8-A DoPD is implemented in iMX8QM? If it is not, EDECR comes in Debug power domain as per ARM v8-A specification.

So it should not clear even if a cold reset is done. What could be the reason for the register is getting reset?

Regards,

Ranjith

[igorpadykov]

Hi Ranjith

in i.MX8 series it is not possible to manipulate A53 core directly, it is done through SCU

System Controller Unit (SCU) Introduction for i.MX 8QXP MEK - i.MXDev Blog 

Best regards
igor

[ranjith_tc]

HI,

Thanks Igor for the support.

So, is ther any way to halt the the A53 cores at reset vector in iMX8QM?

regards.

Ranjith

[igorpadykov]

Hi Ranjith

one can look at documentation included in SCFW Porting Kit

for available reset options.

Best regards
igor

[igorpadykov]

Hi Ranjith

for reset examples one can look at:

imx8.c\platform\user - m4ctrl - M4 Control Tool for i.MX platforms 

Please be aware of partition reset. This will reset only a part of the SoC. It does not rerun the ROM
so code will not be reloaded. By default ATF does a partition reset, not a board reset.

https://community.nxp.com/docs/DOC-341481 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------