AM625: How to define a large capacity variable in a ddr

Hello Yu,

Thanks for reaching out to Texas Instruments E2E support forum.

Sorry, I didn't understand the question completely.

Are you trying to keep the .data section into DDR and want to access this from DDR memory? 

If not can you please specify the exact usecase?

Regards,

Tushar

1 The first, the case is that I define a variable in the DDR, testbuff [5 * 1024 * 1024], which I can read or write from the M core

2 The second one I define a variable in DDR, test [5] [1024] [1024], I can read and write to its individual elements on the M core, for example, test [1][100] [1023] = 10;

Hello Yu,

Thanks for your response.

Are you able to read/write the variable kept in DDR from M4 core?

Are you facing any difficulty or seeing any error logs? If yes can you please share the error logs?

Regards,

Tushar

no,  I do not know how to read/write the variable kept in DDR from M4 core.

Hello Yu,

Thanks for the clarification.

Please refer to FAQ Execute code from DDR using M4F to know how to place a specific section in DDR and access it from M4F core.

Please let us know if you face any difficulty.

Regards,

Tushar

1 1 Since the program performs too slowly in ddr I will still execute the program in the sram

2 If I want to define the global variable in ddr then I modify that in linker.cmd. The bss and data can be done

3 Do I understand that correctly？

Ok thanks I'll test it and thanks again