On Mon, Sep 16, 2019 at 02:00:39PM +0200, Andreas Schwab wrote: > > Try: > > > > earlycon=sifive,0x10010000 > > That's not what Christoph wants. Well, what I want is auto selection if the device tree uses the stdout-path. My Kendryte DT uses that and it works like a charm. If it doesn't work for you on the U54 board chances are that your DT doesn't have the right settings and you have to use the line that Paul posted.