zig build will produce:

• zig-out/bin/avacore (RV32ICM ELF)
• zig-out/bin/avacore.imem.bin (raw image)
• zig-out/bin/avacore.dmem.bin (raw image)

The .imem.bin image is loaded onto the target board's SPI flash.
The .dmem.bin image is currently compiled into the gateware.