flash_range_program will lock up if source data points to flash address #1089
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gh-raspberrypi/pico-sdk#1089
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The
flash_range_program(flash_offs, data, count)will lock up ifdatapoints to an address in the XIP address range, ie points to flash.This can happen when you want to copy some region of flash to another region. I hit this issue in MicroPython, copying a data structure from ROM (XIP flash) to the filesystem (also in flash).
I can understand that it's just a limitation of the
flash_range_program()function, that you must not pass in an XIP flash address as thedataargument. But I think this limitation should be documented, and also possibly an assertion added to check this case.Or would it make sense to allow flash addresses to be passed in, and the function use a temporary SRAM buffer to copy from flash to flash?