QEMU works well for testing program corrections (i.e., will the code run on the actual ARM or PowerPC correctly), but this is bad for testing program effectiveness: emulation is not accurate, and the speed measured with QEMU cannot be reliable ( or even uncertainly) correlates with speed on true equipment.
In addition, QEMU will not catch unreceived memory accesses, which is not a problem for PowerPC emulation (PowerPC allows unrelated accesses), but it can be for ARM (unbalanced access, for example, reading a 32-bit word in RAM from an address that is not a multiple of 4 , will do fine with QEMU, but will throw an exception in the true ARM processor).
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