RPI3B+ was able to load U-Boot on an USB attachted disk. No SD card was avaible.
U-Boot was able to load the image from usb disk and started initramfs.
It stopped right after u-boot has finished and the Raspberrys for each cpu core are displayed.
Still needs some fixing.
Btw: I didn't include a code snippet for programming USB-Boot on RPI3B+ on purpose. The setting is written to an OTP and thus can not be reverted. This should be done by hand:
echo program_usb_boot_mode=1 | sudo tee -a /boot/config.txt
RPI3B+ was able to load U-Boot on an USB attachted disk. No SD card was avaible. U-Boot was able to load the image from usb disk and started initramfs. It stopped right after u-boot has finished and the Raspberrys for each cpu core are displayed.
Still needs some fixing.
Btw: I didn't include a code snippet for programming USB-Boot on RPI3B+ on purpose. The setting is written to an OTP and thus can not be reverted. This should be done by hand:
echo program_usb_boot_mode=1 | sudo tee -a /boot/config.txt