RP2040: Bootloader fixes #165
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The SD-card bootloader occassionally crashed due to either: - USB packets during flash writing (arduino/ArduinoCore-mbed#409) - Some flash XIP issues when function is not in RAM.
Sometimes flash_do_cmd() call would coincide with SysTick interrupt. Interrupts should be disabled when running it.
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Fixes three causes for random hangs at boot time on RP2040:
platform_rewrite_flash_page()crashes randomly if it is not in RAM. Not sure of the root cause.