Initialization problems

Max Zhegulin

Intellectual 420 points

Hi all,

On C5515 EVM based on demo and aic3204 projects from ccs installation directory I build my application.

Program performs recording audio data, acquired from I2S and AIC3204, to Mobile SDRAM and then playback audio.

When I run program under dubug i2s, aic and emif work fine.

But then I load my program from NAND flash application doesn't work.

I guess that the problem is in emif initialization, because if I map audio buffers to internal SARAM, application after booting from NAND works fine. EMIF initialization sequence I took from demo example.

Also interesting note is what if after unsuccessful booting from flash I run the same program under debug, program work's normal. So emif initialization was performed successfully, but why it didn't pass after first boot from flash?

Thanks!

Max

over 14 years ago

0 Peter Chung over 14 years ago

TI__Expert 8065 points

Max,

Are you saying that your program does not work when you allocate audio buffers to NAND flash?

Regards,

Peter Chung

0 Max Zhegulin over 14 years ago in reply to Peter Chung

Intellectual 420 points

Hi Peter,

No, I allocate audio buffer to mSDRAM.

But, when I boot program from NAND flash, during program execution I couldn't access my audio buffers in mSDRAM.

In the same time, under debug I have no problems with accessing audio buffers in mSDRAM.

So I suppose that the problem is near mSDRAM initialization.

It's strange because I took initialization procedure from Spectrum Digital's demo project (asm instructions in reset interrupt routine).

Max

0 Peter Chung over 14 years ago in reply to Max Zhegulin

TI__Expert 8065 points

Max,

While loading a bootimage, the bootloader does not enable SDRAM clock, so without enabling SDRAM manually, I don't think you can allocate your buffer to SDRAM.

You can include register configuration in your bootimage and bootloader will execute the register configuration before loading the bootimage. Please refer to the Bootloader App note for details. http://focus.ti.com/lit/an/sprabd7/sprabd7.pdf

Regards,

Peter Chung

0 Cong Van Nguyen over 14 years ago in reply to Peter Chung

Intellectual 970 points

Hi Peter,

I've just raised this problem in a newer topic http://e2e.ti.com/support/dsp/tms320c5000_power-efficient_dsps/f/109/t/132583.aspx

Is there an example on how to configure EMIF registers when creating the boot image to supprot SDRAM?

Regards,

Cong-Van

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Initialization problems