Resolved! Check SDMMC bus from u-boot
Here the output of some commands issued on our target at u-boot stage:> STM32MP> mmc list > STM32 SDMMC2: 0 (SD) > STM32 SDMMC2: 1 > > STM32MP> ls mmc 0:4 > <DIR> 1024 . > <DIR> 1024 .. > <DIR> 12288 lost+found > 8192 u...