GDT selector question

[Neo]

i getting an error when i use this Selector as the stack segment with esp=0xffffc however using esp=fffc works.
What could be wrong? What i'm trying to do is use the area below 1Mb as a stack

Code: Select all

STACK_SEL   EQU      $-gdt
   dw   0xFFFF
   dw   0
   db   0
   db   0x92
   db   0x4F
   db   0

[Therx]

Memory between C0000 and FFFFF are ROM so can't be used.

Pete