Function program_board_image 

pub fn program_board_image(
    p: &SpatialProgram,
    target: &SpatialTarget,
    board: NexysBoard,
    role: ImageRole,
    top: &str,
    clock: CoreClock,
) -> Result<Vec<(String, String)>, BoardImageError>

The board image of p, a fabric program for target: lowered, its memories loaded with its fills, on board with the top named top and its core at clock, speaking role’s protocol (a decode step’s through its tok, pos and next words). Every file synthesis reads, so its image_digest is the image’s identity.