Hi Stefano,
Specifically, the dcd_ptr in the v2 imx header points to an address in DDR, however I would have thought that on power-up the DCD is loaded somewhere in iRAM (since the DDR isn't running at this stage), and then only once this has been interpreted is the full image loaded into DDR. The tools/imximage.c code appears to only work with DDR addresses, and I'm assuming that this same system works fine on the MX53.
Can anyone shed any light on this?
The bootROM copies the DCD data into an area that is not specified, but we can assume is in the IRAM. As part of the boot process, the bootROM copies the image into a DEST memory - this is as it is called in the manuals, and this after the DCD table is parsed and executed. That means that is possible to set dcd_ptr pointint to DDR if the DCD table is programmed to set up the DDR controller, as it is actually done for i.MX51/i.MX53/i.MX6 in u-boot.
Can you recommend any mechanism for debugging the boot rom execution? I can see on the SPI bus that it is trying to read from the boot flash, and it is getting the correct data (ie, the u-boot.imx image is programmed properly). However it is still failing and ending up in USB fall-back mode. Given your comments about the dcd_ptr, I can assume that isn't the problem, which leaves me at a bit of a dead end.
Regards, Andre