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For those who haven’t peeked under the hood of a System-on-Chip (SoC), the key fact to know is that the cost of modern SoCs is driven largely by peripherals and memory. The CPU itself is often just a small fraction of the area, just a couple percent in the case of the Baochip-1x. Furthermore, all peripherals are “memory mapped”: flashing an LED, for example, entails tickling some specific locations in memory. Who does the tickling doesn’t matter – whether ARM or RISC-V CPU, or even a state machine – the peripherals respond just the same. Thus, one can effectively give the same “body” two different “personalities” by switching out their “brains”; by switching out their CPU cores, you can have the same physical piece of silicon run vastly different code bases.
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#3. Model updates are almost a free lunch