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Considering iPhone has their custom processor design, this information is most likely confidential. However, it isn't inconceivable that some sort of memory protection method similar to IOMMU can be added to the internal fabric to prevent baseband processors (or any other peripherals) from accessing arbitrary physical memory.

Thats fine, I just wasn't sure how abrittishguy can state his assertions so absolutely as facts.

The baseband firmware is cyptographically signed by Apple (and would thus require their complicity in backdooring) and the A7 models have a so-called Secure Enclave, which handles the encryption and decryption of memory contents.

Link: http://www.apple.com/ipad/business/docs/iOS_Security_Feb14.p...

Thank you very much, I'll definitely read through the doc through the course of the day. But a cursory glance still does not mean that rogue software on the baseband cannot compromise your phone, but it is getting more and more difficult to place rogue software on the baseband.

"And would require Apple's complicity" - Or perhaps rather Qualcomms's...

Why the downvote?