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> Gsm chip for example is connected to memory bus and can read any memory location Whether or not a component is part of the SoC isn't directly connected to whether or not it's isolated. Separate chips often have DMA, and SoC components usually have better IOMMU configuration.
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The claim you're repeating is incorrect. It's a falsehood propagated as part of marketing for products that are making a dishonest attempt to distinguish themselves from existing mainstream devices while they are objectively delivering hardware offering less privacy and security.
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What do you want broken down? The claim you're repeating about cellular basebands is untrue. Many hardware components typically have DMA access, including off-die components like Wi-Fi, and it doesn't mean they aren't isolated. It depends on the IOMMU and driver implementations.
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It's not my opinion that the statement you're making about basebands is untrue. A component being on the SoC doesn't mean it isn't isolated. A component being on a separate chip doesn't mean it is isolated. Those are objective reality is that it depends on the implementation.
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It's wrong to portray mobile as a different situation than desktops and similarly to portray mobile basebands as an extremely special case. A desktop CPU is already a vastly complex system of hardware, microcode and firmware, and there are many other components in a system.
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A laptop or desktop will often have dozens of different processors effectively running their own operating systems. The main difference with phones is that more of this is provided by a unified SoC from one company with shared security work, rather than many different companies.
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