In the RL78 FAR data model, pxPortInitialiseStack() did not initialize
the register image for the task parameter (pvParameters) correctly.
A:DE registers were saved with dummy values instead of the actual pointer.
Effect: on first context restore the function prologue read a corrupted
parameter. NEAR builds were not affected.
This patch aligns the FAR path with the calling convention and compiler
version:
- IAR V2: pass pvParameters via registers → DE = low 16 bits, A = high 8
- IAR V1 (fallback): keep legacy stack write
Also keeps the original stack-frame layout and updates the comment to
reflect that pointer sizes depend on __DATA_MODEL__.
Result: tasks in FAR receive the correct parameter at entry; NEAR remains
unchanged.
Co-authored-by: Thomas Quiniou <tquiniou@fdi-access.com>
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