RTOS/AM5728: IPC shared region 0

Omid MDB

Part Number: AM5728

Tool/software: TI-RTOS

Hi,

SR_0 are located at 0xBFC00000 physical address. This is inside the RAM but outside of any carveout. How does the Linux-side know that this area is used by the Shared Region #0? please refer to the ex41_forwardmsg example.

-config.bld

/* Shared region definition used in app */
var evmDRA7XX_SR_0 = {
        name: "SR_0", space: "data", access: "RWX",
        base: 0xBFC00000, len: 0x100000,
        comment: "SR#0 Memory (1 MB)"
};

-Resource table

#define DSP_SR0_VIRT 0xBFC00000
#define DSP_SR0 0xBFC00000

Best regards,

Omid

over 7 years ago

0 Sahin Okur over 7 years ago

TI__Mastermind 27355 points

Hello Omid,

DEVMEM doesn't provide any protection from the Linux kernel so I would assume that you would need to add an entry to the Linux device tree similar to a carveout like below, but I'm checking with the IPC developer. I will let you know once I confirm.

&reserved_mem {

               dsp1_sr0: dsp1_sr0@bfc00000 {

                reg = <0x0 0xbfc00000 0x0 0x100000>;

                no-map;

                status = "okay";

        };

};

Regards,
Sahin

0 Sahin Okur over 7 years ago in reply to Sahin Okur

TI__Mastermind 27355 points

Omid,

I confirmed with the IPC developer that you will need to add an entry to the Linux device tree to protect against the Linux kernel.

0 Omid MDB over 7 years ago in reply to Sahin Okur

Intellectual 690 points

Sahin,

Thank you for your continued support.

Best regards,
Omid

Processors

Processors forum

RTOS/AM5728: IPC shared region 0