Is U-Boot inside m1n1 able to boot from external drives such as Type-A USB sticks?

[fmatrixch]

I used balenaEtcher to burn Ubuntu Server ARM64 image file (installed from Canonical official site) to my SanDisk USB-A stick on macOS 15.0 Beta, and connected to my ARM Mac device (MacBook Pro 13-inch M1, Late 2020). Then I selected asahi-linux option as my startup disk, restarted, and press a key when U-Boot mentioned me pressing any key to stop booting from any disk. Unfortunately, I cannot boot from the USB-A stick when I tried to boot from USB devices by using the command usb start

I've heard that the Apple Silicon devices can't recognise external drives and boot from external drives directly. However, I asked the same question to Microsoft Copilot in Bing Search before burning my USB stick, and Copilot gave me the answer "yes" according to Internet information.

[fmatrixch]

Oh, no. The startup command is not true in my previous text. It's usbboot addr dev/sda