We have a IMXRT1010 MCU project, where we execute from external flash directly (no ITCM, all RAM is mapped to DTCM), and due to EMI reasons we must spread the QSPI clock's spectrum.
1. The ConfigTools generated code prevents modifying the FlexSPI clock source when the XIP_EXTERNAL_FLASH is set. However we have found that as long as the FlexSPI clock isn't disabled, only the clock source is modified on the fly, we could change the clock source for it. I realize that this is a risky move, so I want to understand what's the recommended way of changing the FlexSPI clock source with XIP? I would also need to know how the bootloader configures the FlexSPI clock source (to avoid temporarily overclocking it while changing the source and dividers)?
2. The ConfigTools don't have any option to configure the spread spectrum parameters of the PLLs, even though it generates the sysPllConfig_BOARD_BootClockRUN (constant) structure that is supposed to hold these parameters. So I don't have good maintainable options to set the spread spectrum parameters using this toolchain. I can either:
- modify sysPllConfig_BOARD_BootClockRUN in the generated code, and pay attention to restore these fields each time the code is regenerated;
- call CLOCK_InitSysPll() a second time with new parameters, outside of the correct clock initialization sequence;
- maintain a copy of BOARD_BootClockRUN() function and synchronize the generated changes into it;
none of which sounds very appealing. So I kindly ask that you introduce this configuration into the ConfigTools instead.
