(venvbuildstream) [will@wsx280 multi-vim]$ bst -o target_board rpi3 -o target_arch aarch64 artifact checkout --no-integrate deploy/image.bst
[--:--:--][        ][    main:core activity                 ] START   Loading elements
[00:00:00][        ][    main:core activity                 ] SUCCESS Loading elements
[--:--:--][        ][    main:core activity                 ] START   Resolving elements
[--:--:--][        ][    main:bst-boardsupport.bst:board/raspberrypi/nonfree-firmware.bst] STATUS  Running host command

    /usr/bin/git --version

[--:--:--][        ][    main:bst-boardsupport.bst:board/raspberrypi/userland-firmware.bst] STATUS  Running host command

    /usr/bin/git --version

[00:00:00][        ][    main:core activity                 ] SUCCESS Resolving elements
[--:--:--][        ][    main:core activity                 ] START   Initializing remote caches
[00:00:00][        ][    main:core activity                 ] SUCCESS Initializing remote caches
[--:--:--][        ][    main:core activity                 ] START   Resolving cached state
[00:00:00][        ][    main:core activity                 ] SUCCESS Resolving cached state

Error while staging dependencies into a sandbox: 'ISA 'aarch64' is not supported by buildbox-run.'
(venvbuildstream) [will@wsx280 multi-vim]$