Not possible today but it is planned and coming soon: add a ram0 target.
A other solution it is change the bootcmd to execute a the U-Boot dfu command with ram target when the board is booting from usb and only use STM32CubeProgrammer to load U-boot in DDR, then using dfu-utils to load kernel in DDR.
something like
1/ define dfu ram target with U-Boot variable:
dfu_alt_info=uImage ram ${kernel_addr} 0x2000000;devicetree.dtb ram $[fdt_addr_r} 0x1000000;
2/ update U-boot command
#define STM32MP_BOOTCMD "bootcmd_stm32mp=" \
"echo \"Boot over ${boot_device}${boot_instance}!\";" \
"if test ${boot_device} = serial || test ${boot_device} = usb;" \
- "then stm32prog ${boot_device} ${boot_instance}; " \
+ "then dfu 0 ram 0; bootm ${kernel_addr} ${devicetree_addr};" \
"else " \
"run env_check;" \
"if test ${boot_device} = mmc;" \
"then env set boot_targets \"mmc${boot_instance}\"; fi;" \
"if test ${boot_device} = nand ||" \
" test ${boot_device} = spi-nand ;" \
"then env set boot_targets ubifs0; fi;" \
"run distro_bootcmd;" \
"fi;\0"
not tested, perhaps need some tuning.
regards
