Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Raspberry Pi/RP2040/PADS_QSPI/VOLTAGE_SELECT#0x0
VOLTAGE_SELECT=3v3
Voltage select. Per bank control
0 (3v3): Set voltage to 3.3V (DVDD >= 2V5)
1 (1v8): Set voltage to 1.8V (DVDD <= 1V8)
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https://github.com/cmsis-svd/cmsis-svd-data