I remember having similar problem with that Intel536ep module.
Be sure to have the gcc-3.2 compiler installed as the 536EP corecode is
compiled with this version : from the "readme.txt" in the 536EP tarball :
"2. Release Notes
This release supports 2.4.x kernels.
This release is not compatible with kernels prior to 2.4.
The 536EP corecode binary was compiled with gcc version 3.2"
this is what I have installed on my testing/sid with 2.4.22 kernel :
hi gcc 3.3.1-2 The GNU C compiler.
hi gcc-3.2 3.2.3-8 The GNU C compiler
hi gcc-3.2-base 3.2.3-8 The GNU Compiler Collection (base package)
hi gcc-3.3 3.3.2-0pre5 The GNU C compiler
hi gcc-3.3-base 3.3.2-0pre5 The GNU Compiler Collection (base package)
I have also the complete source of the kernel installed.
Also remember to recompile the module after each kernel compile.