How to find the NSEC_DDR_0_BASE and NSEC_DDR_0_SIZE needed by dynamic memory sharing for a given platform?

[ZhanYF]

Hi,

To enable dynamic memory sharing for optee os, I believe that NSEC_DDR_0_BASE and NSEC_DDR_0_SIZE need to be declared, but I don't know how to find the address base and have doubts on which format should the size be declared in.

For my rk3399 system with 4GB of memory I'm using register_ddr(0x00000000, 0xF6000000); now, it appears to work, but I doubt this is the correct values. Unfortunately rk3399's device tree source does not contain the base address, nor can I find this information from SoC's datasheet.

Any ideas on how can I find and validate the memory base and size? is this totally board-dependent?

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[jenswi-linaro]

I have a Rock4A+ that I've started to play with for testing purposes.
I can't find the memory node in the DTB supposedly used by the kernel.
I'll let you know if I find out anything more.

[github-actions]

This issue has been marked as a stale issue because it has been open (more than) 30 days with no activity. Remove the stale label or add a comment, otherwise this issue will automatically be closed in 5 days. Note, that you can always re-open a closed issue at any time.