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Original question:

AM6548: How to access to external DDR memory from R5F

AM6548: R5F DDR access

Nia
Prodigy 70 points

Part Number: AM6548

Hi, I have some basic queries ...

Can anyone point to R5f -DDR access sample examples .

I have modified ex02_messageq linux example with direct pointer access to DDR location 0x80000000 and write to the same , and then I built $ make ti-ipc-linux-examples from linux SDK.  New binaries are getting created under host and r5f ,but does not seem to be working when loaded. 

Do I need to make ipc_bios everytime ?

  • 0
    TI__Guru** 109910 points

    Hello Nia,

    1) What version of Processor SDK are you using?

    2) What do you want to use the DDR memory for? e.g., passing data between ARM and R5F?

    3) Please take a look at our IPC for AM65x documentation, particularly section "Understanding the Memory Map". I expect that the kernel will not allow the R5F to write to 0x8000_0000 through 0x80d9_ffff.

    4) You can see the currently assigned DDR memory sections in the device tree file arch/arm64/boot/dts/ti/k3-am654-base-board.dts

    Regards,

    Nick