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Original question:
I have a custom board with am3352 on it. I've got working image built using Yocto(uboot version 2014.07 and kernel 4.14). I'm trying to build new image with uboot 2020.01 and kernel 5.4(yocto dunfell), but uboot is not working. I'm booting from MMC, but there is no ouput on console at all, so even Uboot SPL is not working. I know that there were big changes beetwen these 2 versions, but what are possible ways to debug such problem?
I'm sure that hardware is fine, since the old image is still working.
