3 ms·
Is this true of say, the iPhone? It seems like a wifi iPad or iPod Touch is exactly the same as an iPhone, but without the baseband. If the baseband were a peri
by nsxwolf 12y ago
Is this true of say, the iPhone? It seems like a wifi iPad or iPod Touch is exactly the same as an iPhone, but without the baseband. If the baseband were a peripheral of the A8 SoC, this would seem like a trivial difference. But it seems if that's not the case, the iPad A8 would have considerable architectural differences compared to the iPhone one.
- JoshTriplett 12y agoIt's less true in some modern smartphones (disclaimer: not an expert on the iOS/iDevice architecture in particular), but a shocking amount of code still ends up on the baseband, and the baseband still has as much trust as the kernel. For example, the baseband processor often serves as an offloading engine for power efficiency reasons, to avoid waking up the main processor; thus, the baseband processor might have direct access to the audio hardware, so that phonecall audio doesn't need to wake up the host CPU.