Originally Posted by Imkantus

Both result into dyld related sysenter traps when launching 32-Bit Apps, both Kernel are fine when booting maxmem=4000 - so I think this is actually sort of bug in the Kernel Patch not in custom dyld.

Currently I am using some older Kernel Patch that Andy has once released for use with 10.6.4 compiled with latest Darwin source code, in combination with manually patched sysenter traps (code signatures not removed manually) in dyld, libSystem.B.dylib, libSystem.B_debug.dylib and libSystem.B_profile.dylib
This make me able to use full 8GB of memory in -force64 mode + fully working 32-Bit Apps.