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After modifying mode transition for branch prediction tz_vmm wasn't working anymore on hw_imx53_tz but the modifications had nothing to do with the VM code. However, the amount of instructions in the MT before the VM exception-vector changed. So I tried stuffing the last working version with NOPs and found that tz_vmm worked for some NOP amounts and for others not. Thus, I increased the alignment of the VM exception-vector from 16 bytes to 32 bytes, é voila, its working with any amount of NOPs as well as with branch prediction commits. ref #474