In WinCE 4.2, LPD had a special environment variable called RELOCATE_FROM_FLASH that you could use to create an image that could be burned to FLASH, but would be relocated to RAM upon boot.

I tried using this env var in a WinCE 5.0 build which incorporates the LPD BSP and Kernel. When I download the build via Platform Builder to the card engine, an 'R' appears instead of an 'F' at the start of the download in LoLo. This indicates that the build is a RAM build. In WinCE 4.2, if RELOCTATE_FROM_FLASH was defined, an 'F' would appear indicating the build was a FLASH image.

Is there a new environment variable I need to use instead to accomplish this task?

I defined the variable via the Platform Settings --> Environment dialog box in Platform Builder. (RELOCATE_FROM_FLASH = 1).