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Modified harvard architecture

deepud

Hello,

I am preparing for the AAE. ARM is a modified Harvard architecture. What is this about ? I searched in internet and got various answers.

Can anyone tell me exactly what is this modified Harvard architecture in ARM's point of view ? Please point to any relevant literature.

Regards,

Deepu

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  • 0 in reply to G. Goodwin L. Pitos

    Yes I should have said could support Harvard rather than will. There's always the problem of either loading up the code memory from flash which means there is a data path to the code memory - or executing directly from flash in which case one would really want to be able to access data there as well. So there is a data path to the code memory to which access must be restricted. This I guess is where Trustzone comes in, it must be able to restrict changes to the XOM property. I guess one could use a different address range for data access but that is messy. I look forward to seeing more details about the ARMv8-M additions and how they all fit together - I heard they loosed some hackers on it to test out the security.

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  • 0 in reply to G. Goodwin L. Pitos

    Yes I should have said could support Harvard rather than will. There's always the problem of either loading up the code memory from flash which means there is a data path to the code memory - or executing directly from flash in which case one would really want to be able to access data there as well. So there is a data path to the code memory to which access must be restricted. This I guess is where Trustzone comes in, it must be able to restrict changes to the XOM property. I guess one could use a different address range for data access but that is messy. I look forward to seeing more details about the ARMv8-M additions and how they all fit together - I heard they loosed some hackers on it to test out the security.

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