![]() img onto has the same PARTUUID, so it just works flawlessly for booting from microSD, right?) For me, in order to boot to my sda2 partition I had to use # blkid to read the PARTUUID of the disk's sda2 partition and write that value into the PARTUUID value of the microSD's /boot/cmdline.txt file. Wait? What? In the distributed microSD image, file /boot/cmdline.txt points to the PARTUUID of the "/" partition on the target microSD card. You can edit config.txt using the nano editor using the command:- sudo nano /boot/config.txt # then scroll all the way to the bottom ![]() ![]() Make sure there is no blank line at the end of config.txt. If you wish, you can remove the 'program_usb_boot_mode' line from config.txt, so that if you put the SD card in another Raspberry Pi, it won't program USB boot mode. If the bit is still not set, this may indicate a fault in the Pi hardware itself. In this case, go through the programming procedure again. If it is not, then the OTP bit has not been successfully programmed. Then check that the OTP has been programmed with:- vcgencmd otp_dump | grep 17:Ĭheck that the output 17:3020000a is shown. Reboot the Raspberry Pi with:- sudo reboot This adds program_usb_boot_mode=1 to the end of /boot/config.txt. Then enable USB boot mode with this code:- echo program_usb_boot_mode=1 | sudo tee -a /boot/config.txt First, prepare the /boot directory with up to date boot files:- sudo apt update & sudo apt upgrade & sudo reboot You can use any SD card running Raspbian or Raspbian Lite to program the OTP bit. Note that any change you make to the OTP is permanent and cannot be undone. ![]() Once this bit has been set, the SD card is no longer required. To enable the USB boot bit, the Raspberry Pi 3 needs to be booted from an SD card with a config option to enable USB boot mode. The Raspberry Pi 3 B+ is able to boot from USB without any changes, but the Raspberry Pi 3 requires the USB boot bit to be set in the OTP (one-time programmmble). ![]()
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