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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
