@corto
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From a technical point of view, I would be curious to learn what you do that is not compatible with Book-E processors. I suppose it is related to MMU ...
Since WarpOS executables use the m68k HUNK executable format their PPC code is loaded in non-executable RAM and the OS4 powerpc.library has to make it executable. On the other CPUs that's done with the segment registers which don't exist in Book-E CPUs.
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Edit : Hum ... maybe about the FPU ?
That didn't even work on 60x, 750 and 74xx CPUs, a lot of WarpOS software uses unaligned FPU accesses which even those CPUs don't support and a lot of WarpOS software can only work because powerpc.library installs alignment exception handlers which emulate them using integer accesses.
On the SAM440ep that's probably not required since the SAM440ep kernel includes an alignment exception handler already, unlike on 60x, 750 and 74xx CPUs on the 440ep 4 byte alignment isn't enough for 64 bit FPU accesses (it must not cross a 16 byte boundary, which is automatically the case if the alignment is correct: 4 bytes for float, 8 bytes for double).