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>`
- postmarketOS/pmbootstrap@942ee20789 is required to ignore sdcard check. Thanks @ollieparanoid for the patch.
5. `pmbootstrap flasher flash_kernel`
6. Insert the USB drive to OTG and boot
[ci:skip-build]: already built successfully in CI
Raymond Hackley
10eb68fe05