Question about GSL

[debrouxl]

Correct. XIP works with NOR Flash memory, but not with NAND Flash memory.
The sad thing is that for Flash, NAND technology is denser than NOR technology, so most NOR Flash memories are only several kilobytes to several megabytes.
Multiple older calculator series use NOR chips, but the higher-end models with more persistent storage space, at least the whole TI-Nspire series and the Prime (not sure about the Casio fx-CP400, but both the hardware and software of that PoS are limited, despite the very high price tag, so few people care), are equipped with NAND chips.