I built a custom image from the latest sources for the imx6q-sabresd board. The image works fine but I'd like to change the u-boot to initialize the dram to a slower speed so we can test if our software will continue to perform properly. There are a number of posts with this same question but the version of u-boot seems to be quite a bit different. I'm using 2018.17. The older posts refer to flash_header.S or a various DTC table versions which don't seem to have changed in the latest version. Either that or I just don't know where to look which could also be the case.
Anyhow, anyone have a quick pointer to the right sources to start looking at?