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by jack12 2521 days ago
As your parent says, the Pi 4 doesn't support USB or network booting yet. From your link:

> Support for these additional bootmodes will be added in the future via optional bootloader updates

I believe they need to write (bootloader) drivers for the PCIe host and for the new USB3 chip before USB boot can be supported by the bootloader, while netboot requires a driver for the new gigabit ethernet core.
1 comments
andymal 2521 days ago
You can use micro sd card for the bootloader and boot from USB 3 ssd on rpi4.

https://jamesachambers.com/raspberry-pi-4-usb-boot-config-gu...

link
inetknght 2521 days ago
That's not _quite_ booting _without_ an SD card though ;)
link