DDR initializing for OMAP-L138 EDMA3 mcsdk example

Dmitriy1

Other Parts Discussed in Thread: OMAP-L138

Hi All!

I try to understand structures of example projects for OMAP-L138 from TI. I investigated edma3_lld_02_11_09_08 examples. For ping-pong sample I see that routine use adress location of DDR:

signed char __attribute__((section(".my_sect_ddr"))) _pingpongDestBuf[PING_PONG_DDR_BUFFER_SIZE] __attribute__ ((aligned (EDMA3_CACHE_LINE_SIZE_IN_BYTES)));

but I do not see any external memory initialization function in the project. Project also has no any *.gel scripts which is also can provide initialize routine.

Where DDR initialization performing?

over 9 years ago

0 Titusrathinaraj Stalin over 9 years ago

TI__Guru** 116100 points

Hi Dimitry,

Could you please tell me , why do you looking for DDR init and intention please ?

When you run this example on CCS, gel file initialize the DDR and able to run the program on DDR in case you have TI EVM boards.

Suppose if you have custom made with different DDR make then you have to change the DDR registers(SDTIM and SDCR etc., timing parameters) to initialize in gel file.

If you need to boot from flash and not using JTAG or emulator then you will convert .out to .bin through AISGen tool, that time you have to give input for the DDR timing registers etc .,

0 Dmitriy1 over 9 years ago in reply to Titusrathinaraj Stalin

Intellectual 710 points

Thanks for the answer, Titus!

I'm looking for DDR init because I learn and want to know about application construction.

So, if DDR initialization located in gel file, where is this file located? I see only cfg configuration file for the project.

Can you show me location of gel file for edma3_lld_02_11_09_08 examples?

0 Titusrathinaraj Stalin over 9 years ago in reply to Dmitriy1

TI__Guru** 116100 points

Hi Dimitry,

Please refer to the location of your CCS installation path on your host PC.

C:\ti\ccsv5\ccs_base\emulation\boards\lcdkomapl138\gel

Th gel file will be called when you do "Connect target" or debug the program through CCS.

0 Dmitriy1 over 9 years ago in reply to Titusrathinaraj Stalin

Intellectual 710 points

Thanks, Titus!

Does it is mean that I can use gel file as initialization code not only for debug, but for final progect too?

0 Titusrathinaraj Stalin over 9 years ago in reply to Dmitriy1

TI__Guru** 116100 points

Nope.

The gel file is used only for initialization when you debug.

You have to use "AISgen tool's .cfg file, in that you have to change the DDR parameters and PSC numbers etc.,

Please refer to the AISGen tool wiki.

http://processors.wiki.ti.com/index.php/Boot_Images_for_OMAP-L138#Obtaining_the_software

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DDR initializing for OMAP-L138 EDMA3 mcsdk example