On Fri, 25 Jul 2014 09:15:22 -0500, Rob Herring <robherring2@xxxxxxxxx> wrote: > On Fri, Jul 25, 2014 at 6:02 AM, Vineet Gupta > <Vineet.Gupta1@xxxxxxxxxxxx> wrote: > > Hi Grant, > > > > linux-next has a series for arc_uart (via tty tree) which converts it to generic > > earlycon and specifies console via /chosen/stdout-path vs. an explicit param in > > /chose/bootargs > > > > 2014-06-24 9da433c0a0b5 ARC: [arcfpga] stdout-path now suffices for earlycon/console > > > > This relied on prev commit of yours (from linux next of 20140711), which seem to > > have disappeared now. > > > > 2014-03-27 a9296cf2d0b6 of: Create of_console_check() for selecting a console > > specified in /chosen > > 2014-03-27 cfa9cacc5dd3 of: Enable console on serial ports specified by > > /chosen/stdout-path > > > > Is there a specific reason for dropping these patches (or perhaps a merge to be > > merged). I cherry-picked both but still doesn't work. > > > > Can you please advise next step forward, before I go off debugging with those > > patches in. > > There's an issue that if you have stdout-path and "earlycon" on the > command line, the kernel will switch to tty0 and disable the earlycon. > > This is the "fix", but I don't like adding the DT dependency into generic code: Yes, I'm not fond of it either. I've not been able to test it though and work out a proper bug fix. As far as I can understand, the earlycon code only works on aarch64, correct? I haven't been able to get an aarch64 boot working in QEMU yet. g. > > @@ -2382,7 +2386,7 @@ void register_console(struct console *newcon) > if (newcon->setup == NULL || > newcon->setup(newcon, NULL) == 0) { > newcon->flags |= CON_ENABLED; > - if (newcon->device) { > + if (newcon->device && !of_stdout) { > newcon->flags |= CON_CONSDEV; > preferred_console = 0; > } > > Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html