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SPI24 boot problem

Hello,

We have a small board based on the DSP tmsdm6437. The only boot mode supported with this board is "24-bit SPI boot".
In order to test the boot, we have followed the steps montionned in your article: http://www.google.com/#hl=fr&source=hp&biw=1440&bih=683&q=DM643x+24-bit+SPI+Secondary&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=245126edbd5944dd


After reseting the device, we have no boot from the SPI flash.

So, what could be the explanation of this?

Is there a missed configuration?

 

Regards,