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Can I map the code/data memory as device memory

allen.zhang

For example, map the EL3 firmware memory as device memory, What we should concern? Thanks!

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  • 0 Arm Employee Badge in reply to allen.zhang
    Hi,

    IO memory needs to be uncached but Device memory is always uncached so that is cool.

    Instructions must be in Normal memory, which can be cached or uncached.

    @EL3 with the MMU off *all* data accesses will be to Device memory and *all* instruction fetches will be to Normal memory. The address range doesn't matter.
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  • 0 Arm Employee Badge in reply to allen.zhang
    Hi,

    IO memory needs to be uncached but Device memory is always uncached so that is cool.

    Instructions must be in Normal memory, which can be cached or uncached.

    @EL3 with the MMU off *all* data accesses will be to Device memory and *all* instruction fetches will be to Normal memory. The address range doesn't matter.
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