How to use L2cache under davinci

David

Intellectual 620 points

Hi,all

I used to use L2cache on dm642 like below:

// In cmd file I declare a section “Datatableblock”

SECTIONS
{
Datatableblock >L2
}

// Then in c source file I can use it

#pragma DATA_SECTION(Datatableblock，It．Datatableblock”)
Uint8 Datatableblock[64*64]；

Now I turn to davinci dm6467T ，how can I declare my section “Datatableblock” .I add below text in dm6467.tcf file.

var device_regs = {
    l1DMode: "4k",
    l1DHeapSize: 0x1000,   // use 4k of L1DSRAM for heap
    l2DMode: "128k",
    l2DHeapSize: 0x20000,   // use 128k of L2DSRAM for heap
};

Can anyone tell me what to do next.Thanks in advance.

Regards,

-David

over 13 years ago

0 Steven Connell over 13 years ago

TI__Mastermind 45025 points

Hi David,

Which version of BIOS are you using?

Also, which version of XDC tools are you using?

David said:
var device_regs = {
    l1DMode: "4k",
    l1DHeapSize: 0x1000,   // use 4k of L1DSRAM for heap
    l2DMode: "128k",
    l2DHeapSize: 0x20000,   // use 128k of L2DSRAM for heap
};

This code actually won't work in your *.tcf file. I recommend that you use the graphical configuration tool (gconf) to change you memory map. E.g. in the global "GBL" module you can configure these things:

This will result in the following config code:

bios.GBL.C64PLUSL1DCFG = "4k";

bios.MEM.instance("CACHE_L1D").space = "code/data";
bios.MEM.instance("CACHE_L1D").createHeap = 1;
bios.MEM.instance("CACHE_L1D").heapSize = 0x00001000;

bios.GBL.C64PLUSL2CFG = "128k";
bios.MEM.instance("CACHE_L2").space = "code/data";
bios.MEM.instance("CACHE_L2").createHeap = 1;
bios.MEM.instance("CACHE_L2").heapSize = 0x00020000;

However, before doing the above, can you clarify on what you are trying to achieve with your memory map?

Steve

0 David over 13 years ago in reply to Steven Connell

Intellectual 620 points

Hi,Steven

First thanks for your answer，my bios version is 5_41_00_06 and the xdc is xdctools_3_16_01_27.They are both in dvsdk_3_10 under unbuntu linux operating system，so I do all the work under linux system .

I want to use edma between external memory DDR2 and internal memory L2. So I need to build a section like below:

SECTIONS
{
Datatableblock >L2
}

My chip is dm6467T ,which has a dsp core with bios operating system and a arm core with linux operating system.If you have any other questions ,I will try to explain.

Regards,

-David

0 Steven Connell over 13 years ago in reply to David

TI__Mastermind 45025 points

David,

David said:

SECTIONS
{
Datatableblock >L2
}

// Then in c source file I can use it

#pragma DATA_SECTION(Datatableblock，It．Datatableblock”)
Uint8 Datatableblock[64*64]；

So the above is what you had in your linker command file for the DM642? Did you try that same linker command SECTIONS directive for your DM6467T? I would expect that this should work combined with the #pragma C code.

Again I'd recommend using the configuration tool to re-arrange your memory map if you need to.

Steve

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How to use L2cache under davinci