# Boot configuration GPIO settings

Source: [https://docs.qualcomm.com/doc/80-PV086-5P/topic/boot-configuration-gpio-settings.html](https://docs.qualcomm.com/doc/80-PV086-5P/topic/boot-configuration-gpio-settings.html)

The following table lists the boot configuration and GPIO settings.

| Boot configuration no. | GPIO no. | Function | Bit values |
| --- | --- | --- | --- |
| BOOT\_CONFIG\_0 | GPIO\_128 | WDOG disable | 1 – Disables WDOG<br><br><br>              <br>0 – Enables WDOG |
| BOOT\_CONFIG\_1 | GPIO\_27 | Fastboot bit 0 | Selects external boot device |
| BOOT\_CONFIG\_2 | GPIO\_47 | Fastboot bit 1 | Selects external boot device |
| BOOT\_CONFIG\_3 | GPIO\_76 | Fastboot bit 2 | Selects external boot device |
| BOOT\_CONFIG\_4 | GPIO\_90 | Fastboot bit 3 | Selects external boot device |
| FORCE\_USB\_BOOT | GPIO\_132 | Force USB download | 0 – Releases USB download mode<br><br><br>              <br>1 – Enables USB download mode |
|  |  |  |  |
|  |  |  |  |
|  |  |  |  |

Note: External pulls or logic high on BOOT\_CONFIG [4:1] before RESOUT\_N getting asserted high can force QRB5165 device to boot from an unintended boot device.

**Parent Topic:** [Boot configuration and memory](https://docs.qualcomm.com/doc/80-PV086-5P/topic/boot-configuration-and-memory.html)

Last Published: Jul 07, 2023

[Previous Topic
External boot devices](https://docs.qualcomm.com/bundle/publicresource/80-PV086-5P/topics/external-boot-devices.md) [Next Topic
FORCE\_USB\_BOOT](https://docs.qualcomm.com/bundle/publicresource/80-PV086-5P/topics/force-usb-boot.md)