Do I need to change also some configuration in the u-boot?
@schnudi
Yes, you need to change bootargs.
I have added earlyprintk option to bootargs, like this
earlyprintk=serial,ttyS0,115200
@sirajmuhammad
Previously I have problems with finding those xml files for my board. The vendor of my board doesn’t supply them now. I was suggested to write dts by hand, using dts from Linux as a starting point.
Looking to you guys I see that I’m not alone. I have many different issues related to using Linux in SoC. I was trying different support approaches. But only one men from EBV helps me a lot. Looks like this forum doesn’t have official support.