Dammit it looks like the ARM i.MX53 Cortex *does* have microcode, MPU in the display subsystem with DMA access http://goo.gl/4aZg4l
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@AndreaBarisani specifically tested mispurposing display *read* DMA to read (really write through display) into TrustZone areas? -
@dragosr yes, 1st party or 3rd party DMA from all bus masters are TZ filtered one way or another
End of conversation
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