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main/postmarketos-initramfs: add USB booting support

Split from !4430 (closed)

How to boot from USB drives:

  1. Make sure the extcon has OTG support and included in initramfs
  2. Make sure the PMIC supports the power to OTG devices, and included in initramfs. Otherwise, a hub with external power supply is required.
  3. Make sure module usb-storage is enabled in initramfs
  4. pmbootstrap install --sdcard=/dev/<usb_drive>
  5. pmbootstrap flasher flash_kernel
  6. Insert the USB drive to OTG and boot
Edited by Raymond Hackley

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