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> Phones typically have 2 operating systems A separate OS runs the security chip (like Titan). Another could be running in EL3 (Trusted Execution Environment),
by ignoramous 15d ago
> Phones typically have 2 operating systems
A separate OS runs the security chip (like Titan). Another could be running in EL3 (Trusted Execution Environment), yet many could be running in Realms (mutually untrusted VMs). The later stage bootloaders and some firmware (ex: GPUs) themselves could be considered OSes in their own right.
- w3ll_w3ll_w3ll 15d agoAlso, the SIM card has its own operating system.
- embedding-shape 15d agoAlso, most smartphones today have at least one browser installed, they're basically their own tiny little OSes at this point.