How to use external DDR for .text section of ARM code?

MikeH

Other Parts Discussed in Thread: OMAP-L138

I would like to use DDR for some of my OMAP-L138 ARM .text code section. However, I'm not quite sure how to do this since, when using CCS (and no GEL file) the ARM has not yet initialized the DDR. Therefore CCS cannot load the code in that section for emulation and debugging. Conceptually, how should this work? Especially during initial debugging when the code changes every few minutes. I can understand that I may have to write a custom boot loader of some kind, but the boot loader would need to load the program from somewhere....?

Thx,

MikeH

over 14 years ago

0 jc-ti over 14 years ago

TI__Mastermind 27585 points

When developing and debugging, most users will choose to have the GEL file initialize the DDR. That should speed up development, and once you are finished, you can include the DDR initialization in your own code.

Jeff

0 MikeH over 14 years ago in reply to jc-ti

Guru 15580 points

Thanks Jeff. That is what I am now doing. However, when I have finished my debugging phase, how do I then load then load my ARM code into DDR? I guess I could use AIS to initialize DDR then have the booloader load the code from SPI flash...?

0 jc-ti over 14 years ago in reply to MikeH

TI__Mastermind 27585 points

Yes that would be the way to do it. Use the AIS DDR initialization and the boot loader. If you have the UART hooked up, it might be easier to use the Uart Boot Host utility so you don't have to keep erasing and rewriting the SPI flash.

Jeff

0 MikeH over 14 years ago in reply to jc-ti

Guru 15580 points

Thanks Jeff!

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How to use external DDR for .text section of ARM code?