It boots with 21.02.0 flashed to the SD card, which seems to have partition UUIDs that U-Boot can understand. For booting 19.07.8, I used
setenv bootargs console=ttyMV0,115200 root=/dev/mmcblk0p2 rw rootwait
setenv bootcmd "ext4load mmc 0:1 ${fdt_addr_r} armada-3720-espressobin.dtb; ext4load mmc 0:1 ${kernel_addr_r} Image; booti ${kernel_addr_r} - ${fdt_addr_r}"
Form what support/device did you try to boot before ?
eMMC ???
Then you must modify bootcmd to set the mmc device before any other commands...
Always MMC (SD card). The default U-Boot loops through the devices looking for one to boot from.
boot_targets=mmc1 mmc0 usb0 scsi0 pxe dhcp
bootcmd=run distro_bootcmd
bootcmd_dhcp=setenv devtype dhcp; run boot_net_usb_start; run boot_pci_enum; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00011:UNDI:003000;setenv bootp_arch 0xb;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
bootcmd_mmc0=devnum=0; run mmc_boot
bootcmd_mmc1=devnum=1; run mmc_boot
bootcmd_pxe=run boot_net_usb_start; run boot_pci_enum; dhcp; if pxe get; then pxe boot; fi
bootcmd_scsi0=devnum=0; run scsi_boot
bootcmd_usb0=devnum=0; run usb_boot
bootdelay=2
distro_bootcmd=scsi_need_init=; for target in ${boot_targets}; do run bootcmd_${target}; done
My 19.07 does not have any partition UUIDs which makes sysupgrade fail later because it does not understand root=PARTUUID=00000000-02. Once I had the 21.02 image on there I had partition UUIDs ok.
21.02 broke my networking though so I'm back to 19.07 for now.
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