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- "platform flash" is flash memory that stores the Xilinx FPGA configuration
- "petacache flash" is the flash memory that lives on DIMM boards associated with the slice FX20s (used only for the petacache project, currently)
- "configuration flash" is controlled by the powerPC software, and contains elf executable images and data needed by the powerPC.
Only the third is relevant for powerPC software/data storage. The configuration flash is 32MB samsung chip. The filesystem file system supports 64 numbered files of which 16 may contain executable images. The remainder of the files may be used for storage of data. The image executable loaded on board-reset and power-on is determined by a rotary selector switch on the front-panel (one for each of the two RCEs on a board). A different executable may be selected in software by writing to a DCR register. The configuration flash may be programmed as described in the Debug section.