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Juno r1 Shareability Memory Attributes

Shengye Wan

Hi experts,

 

I'm using a Juno r1 board for some cache-related research experiment so I'm studying the related memory attributes such as cacheability and shareability.

 

I found the manual mentioned that: " the division between inner and outer is IMPLEMENTATION DEFINED".

However, I tried to search the answer in the juno manual while I don't find any detailed definition about the inner / outer domains?

Does anyone know how to find these concepts for Juno?

 

Thank you in advance.

Simon

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  • +1 Arm Employee Badge in reply to Shengye Wan

    Hi, I think that for Juno...

    wrt the cache settings: The L1/L2 CPU caches are going to be inner and there is no outer system cache (in the interconnect) for Juno.

    wrt shareability: the interconnect (CCI-400) doesn't differentiate between inner & outer. But, the bL system is effectively in a single inner shareable domain. FWIW Linux only supports inner shareable mappings by default.

    HTH
    MarkN.

Reply
  • +1 Arm Employee Badge in reply to Shengye Wan

    Hi, I think that for Juno...

    wrt the cache settings: The L1/L2 CPU caches are going to be inner and there is no outer system cache (in the interconnect) for Juno.

    wrt shareability: the interconnect (CCI-400) doesn't differentiate between inner & outer. But, the bL system is effectively in a single inner shareable domain. FWIW Linux only supports inner shareable mappings by default.

    HTH
    MarkN.

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