quinta-feira, março 12, 2020

Raspberry Pi 3 Broken microSD card slot USB BOOT

Removing sdcard slot
Original post -> https://www.raspberrypi.org/forums/viewtopic.php?t=191197

This can explain how to change setting program_usb_boot_mode=1 using gpio pins
  • The individual OTP bits/fuses, when set disable a certain booting source, regardless of any associated boot source GPIO## wiring? Argh, only now I'm understanding that terse note "note this cannot enable boot modes that have not already been enabled in the OTP" in the documentation; this may be misleading as the OTP rather disables, or am I mistaken here?
  • When a certain OTP isn't set, then a corresponding GPIO## level does enable or disable a certain booting source? Do I need to pull up or down, and which resistance to Vcc or GND will be needed?
  • How is the GPIO## mapping exactly?
    • GPIO22: boot from primary SD
    • GPIO23: boot from secondary SD
    • GPIO24: boot from NAND
    • GPIO25: boot from SPI
    • GPIO26: boot from USB mass storage device


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