What are the implications of a ROMLESS device?
Actually, it's a bit of a misnomer; there is some on-chip ROM containing boot code and a small one-time-programmable (OTP) ROM for the application to use (serial numbers, configuration data, encryption keys, etc.)

But there's no on-chip nonvolatile memory for application code (it seems they wanted to use the chip area to support more SRAM instead), which means that you need to supply some other external memory (flash, SD, hard drive, etc.) to hold the application code and data. If the external device supports random addressing, you can execute code directly from it; otherwise, you can copy code into the on-chip SRAM and execute it from there.