Quickly learn Arm (31)--Memory addressing (4)-EEWORLD

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In order to be compatible with future devices, the entire Boot ROM is mapped to the top of the on-chip memory space. In this way, using a larger or smaller on-chip Flash block will not affect the address of the Boot ROM. The very first byte of the Boot ROM is the exception interrupt vector table. In this way, it can be understood that the remapping of the vector table is actually caused by the remapping of the Boot ROM, and they are one and the same.

Quickly learn Arm (31)--Memory addressing (4)

If the code attempts to access a reserved area address or an unallocated area address, ARM will generate a prefetch abort or data abort exception. We can observe from the previous figure that the address allocation of ARM is not continuous. Some addresses between each memory are not allocated. If our code attempts to access these addresses, such an exception will be generated.

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