sudo ubuntu-image --debug classic image-definition.yamlFor debugging add --workdir /tmp/workdir.
The produced image file ubuntu-<release>-preinstalled-server-riscv64.img.
Copy the bootloader and Ubuntu image to an ext4-formatted USB disk, connect it to the development board, and enter the uboot command line mode through the serial port.
1, Bootloader burning
ext4load usb 0 0x90000000 bootloader.bin
es_burn write 0x90000000 flash2, Ubuntu burning
es_fs write usb 0 ubuntu.img mmc 0
resetLogin with user ubuntu, password ubuntu.
bootloader
bootloader/bootloader_ddr5_secboot_P550.bin