1688051_en-US

i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

Trying to enable SSC on RT1170 EVK with MCUXpresso.

Ref: AN12879

Steps:

1. Base project: SDK Example evkmimxrt1170_semc_cm7

2. Using IDE to config SSC

IDE_Clocking.png

source_diff.png

3. Boot failed

Boot_Failed.png

4. Sometimes can boot normally (~ 1/50)

Any step I missed?

Regards

Seen

Re: i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

Can you detail the changes that were made here, rather than just post demo code? It's difficult to determine what is needed 3 years after this post, when I am having the same problem detailed in this original post.

Thank you.

Re: i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

SDRAM can be initialized by DCD and boot ROM. Then boot ROM will copy your application code to SDRAM. I think the most important thing is the cache problem. You can refer to these link.

https://community.nxp.com/t5/i-MX-RT-Knowledge-Base/How-to-move-CM4-core-project-to-SDRAM-in-RT1176...
2.debug in sdram
https://community.nxp.com/t5/MCUXpresso-IDE/Running-and-debugging-program-in-SDRAM/m-p/1405167
3.Using NonCached Memory on i.MXRT
https://community.nxp.com/t5/i-MX-RT-Knowledge-Base/Using-NonCached-Memory-on-i-MXRT/ta-p/1183369

Regards,

Jing

Re: i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

Hi Jin,

If I want to locate and run program on SDRAM.
What I need to pay attention to?

Regards

Seen

Re: i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

Hi Jing,

It works. Thanks a lot.

Regards

Seen

Re: i.MX RT1170 Failed to boot after Spread Spectrum Clocking is enabled

This is because RT1170 FlexSPI use PLL2 as clock source when use default configure. When you change PLL2 frequency, FlexSPI may fail to get next instruction. To resolve this, you can put fsl_clock.c to SRAM. Please refer to my demo code.

Regards,

Jing