On Fri, 25 Jul 2014 09:15:22 -0500, Rob Herring <[email protected]> wrote:
> On Fri, Jul 25, 2014 at 6:02 AM, Vineet Gupta
> <[email protected]> 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 [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
