Initialize DDR-Memory to store large amount of data during emac bootloading

Frank Bauermeister

Hi experts,

we are using a platform with a C6670 DSP.

Loading a File to the DSP via ethernet we did successfully.

The Problem is, that the DDR-Memory is not initialized during startup , so the data we would like to store there will not be correctly.

But if we initialize the DDR Memory during our program the data we stored will be manipulated.

If we Debug the Project with CCS the DDR-Memory will be initialized via the *.gel File.

The question is now, how we can get the DDR-Memory initialized so that we can use it safely to store Data.

Regards Frank

over 13 years ago

0 Chad Courtney over 13 years ago

TI__Mastermind 30825 points

A typical way of doing this would be to bootload and run a small routine that initializes DDR (and other interfaces) and then sends a packet back to the host to tell it to load the major code portion which includes the DDR space. This is generally referred to as an IBL.

Other alternatives would be having this in an onboard flash, such as I2C flash, which does the initialization of DDR, and then jumps to the ethernet booting.

Best Regards,
Chad

0 Frank Bauermeister over 13 years ago in reply to Chad Courtney

Intellectual 255 points

Dear Chad,

thanks for your fast reply.

I also thought that a secondary bootloader would be necessary.

But do you know if a simple example would be available?

Best Regards Frank

0 Chad Courtney over 13 years ago in reply to Frank Bauermeister

TI__Mastermind 30825 points

Frank,

Sorry for the late reply. I just returned from vacation. I don't have any example code for doing this per se, but I'll ping someone who may.

Best Regards,

Chad

0 ArunMani over 13 years ago in reply to Chad Courtney

TI__Genius 9915 points

Frank,

We have examples in the MCSDK. Check at the folder below. Especially look one for the SRIO. Eventhough it is for SRIO, you can use it for Ethernet with minimal modifications.

mcsdk_2_00_xx_xx\tools\boot_loader\examples

Thanks,

Arun.

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Initialize DDR-Memory to store large amount of data during emac bootloading