Previous FSP versions (for instance Alder Lake) included FSP Integration Guides, which, among other things, documented the amount of pre-memory stack and heap space the bootloader was required to provide for FspMemoryInit. As an example, the Alder Lake FSP Integration Guide specifies a minimum of 284KB of stack space, and at least 128 KB of HOB Heap space.
For Arrow Lake-S, these values do not appear to be documented. What are the required amounts of stack and HOB Heap space for Arrow Lake-S?