Raspberry Pi have defined Metadata Blocks to be used to configure RP2350 applications. These blocks are embedded in the executable UF2 format file. Details of these blocks can be seen in Section 5.9 of the RP2350 DataSheet. The initial release of Astrobe for RP2350 implemented an Image Def block using a set of SYSTEM.DATA statements. These formed part of the LinkOptions module.
In the latest v9.3.3 release of Astrobe for RP2350 we have moved this data into a separate module (called ImageDef) that should be imported into Main immediately after LinkOptions. This allows versions of ImageDef that differ from the one that is distributed with Astrobe to be tailored to suit the particular requirements of an application without invalidating other modules that import LinkOptions e.g. the Memory Allocation Unit (MAU).