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: @@ -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