MIMXRT1170-EVK run with 800MHz crash

[ymj-123]

I choose the "BOARD_BootClockRUN_800M" instead of "BOARD_BootClockRUN" function. But the RT1176DVMAA mcu will crash at the 'CLOCK_SetRootClock(kCLOCK_Root_M7, &rootCfg)' function. How to deal with it? 

[EdwinHz · Accepted solution]

Hi @ymj-123,

I have stumbled into this issue as well in the past. There seems to be a problem with certain batches of the RT1170's ARM PLL, where they are not able to generate a 2.4GHz signal (which is used on the BOARD_BootClockRUN_800M and divided by 3 in order to achieve the the 800MHz clock).

The best work arounds I found were setting the "armPllConfig_BOARD_BootClockRUN_800M" as follows for a 804MHz frequency:

Or setting this configuration variable like this for a difference of 2MHz:

Please let me know if this helps.

BR,
Edwin.