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Booting from SPI - DDR stability problems?

lucv
Prodigy 180 points

Other Parts Discussed in Thread: AM3359

Hi,

I'm working with AM3359 on an own developed board based on AM335x ICEv2. Bootloader and application binaries are stored in SPI flash and the boot- sequence is MMC0, SPI0, UART0, USB0. After a power on, the processor reads SPI flash but the application does not start.
I made the following observations:

  • After a warm reset everythings works fine and the application starts
  • Application also executes after re- powering the board after a few seconds
  • Disconnecting the board from power supply for a long time (approx 30 minutes), causes the same problem that the app does not start

Depending of these observations, there could be some stability problems with the initialization of DDR so that the bootloader can not copy the image to it. In my use the application has to start without a reset and at any time after a power on.
Does anyone has an idea how to analyze this problem? Any help would be appreciated very much!

Best regards,
Luca