arch/arm/src/imxrt: keep the boot ROM's XIP FlexSPI clock setting - #20117
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When executing in place from flash, the XIP FlexSPI clock must not be reconfigured during the initial clock setup. The boot ROM configures the clock for its flash read sequence, and changing it before the board installs a suitable high-speed read sequence can break instruction fetch. The board's flash setup may reconfigure the clock afterward. Signed-off-by: Peter van der Perk <peter.vanderperk@nxp.com>
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Fix nxstyle issues Signed-off-by: Peter van der Perk <peter.vanderperk@nxp.com>
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Summary
When executing in place from flash, the XIP FlexSPI clock must not be reconfigured during the initial clock setup. The boot ROM configures the clock for its flash read sequence, and changing it before the board installs a suitable high-speed read sequence can break instruction fetch. The board's flash setup may reconfigure the clock afterward.
Impact
IMXRT117X
Testing
PX4 FMU-V6XRT board