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66AK2G12: CMA and CMEM - Loading DSP firmware

Guglielmo Navarra
Prodigy 25 points

Part Number: 66AK2G12

Good morning,

I ask to you, why in the main trunk of the linux kernel (ti-linux RT and not) there is not a working configuration within the device tree blob (for K2G ICE) regarding CMA and CMEM.
I need to load the DSP using the mpmcl utility, which uses mpmsrv, which uses CMEM driver,  which uses CMA.
I don't see any complete and working configuration.

Can you help me please?

Thanks

  • 0
    Prodigy 25 points

    The first strange thing seems to be the reserved memory configuration:


            dsp_common_mpm_memory: dsp-common-mpm-memory@81d000000 {
			compatible = "ti,keystone-dsp-mem-pool";
			reg = <0x00000008 0x1d000000 0x00000000 0x2800000>;
			no-map;
			status = "okay";
		};

		dsp_common_memory: dsp-common-memory@81f800000 {
			compatible = "shared-dma-pool";
			reg = <0x00000008 0x1f800000 0x00000000 0x800000>;
			reusable;
			status = "okay";
		};



    In fact if i leave this configuration, the kernel at boot time shows kernel panic on cma_init_reserved_areas. 
    It seems that the CMA cannot access the addresses 0x81f800000 while it does not give the error if i use the address 0x81f80000.
  • 0 in reply to Guglielmo Navarra
    Intellectual 366 points

    Dear mr. Navarra,

    I have a similar problem.

    Waiting for a feedback by the experts...

    Regards