linguini1 commented on issue #16271:
URL: https://github.com/apache/nuttx/issues/16271#issuecomment-2852209273

   After doing more research on this topic I haven't been able to find any 
mention of automatic flashing of RP2040 chips. All sources I've found said that 
the chip requires the "bootsel" button to be held to enter boot mode, or people 
have created custom boot loaders to flash without holding the button.
   
   It was also suggested on this forum to use the SWD pins: 
https://forums.raspberrypi.com/viewtopic.php?t=328795
   
   The pico SDK is meant to have some utilities for rebooting into `bootsel`, 
so it may be possible for the purposes of mass testing to create some 
bootloader/helper program that reboots the pico into bootsel, uploads the 
configuration to be tested, tests it, and reboots into bootsel again to repeat.


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