Hi Peter,
On Wed, Mar 11, 2015 at 2:05 PM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
> On 03/11/2015 06:08 AM, Geert Uytterhoeven wrote:
>> TL;DR
>>
>> After removing the "console=" parameter from chosen/bootargs, and relying
>> solely on chosen/stdout-path, Hiep-san's Linaro userland cannot find the
>> console device anymore.
> The tty subsystem emits the list of consoles as a space-delimited, single text
> line in /sys/class/tty/console/active (alias: /sys/devices/virtual/tty/console/active).
Thanks! I didn't know about that virtual file.
> The first console listed is the primary console.
> tty0 is not resolved to its underlying tty device name.
Are you sure about that? Isn't the last one the primary console?
root@koelsch:~# cat /sys/class/tty/console/active
tty0 ttySC0
If tty0 would be the primary console, getty on /dev/console wouldn't work for
my serial console, as only input on the primary console can be read through
/dev/console if my memory serves me well (or perhaps this has changed?).
Ah, Documentation/ABI/testing/sysfs-tty agrees with me:
What: /sys/class/tty/console/active
Date: Nov 2010
Contact: Kay Sievers <kay.sievers@xxxxxxxx>
Description:
Shows the list of currently configured
console devices, like 'tty1 ttyS0'.
The last entry in the file is the active
device connected to /dev/console.
> That said, is the original reporter of this problem even interested in
> upgrading their userspace, even if this is fixed in Linaro eventually?
> What about other Linaro users?
We'll see...
> I think the only reasonable course here is to continue to support
> "console=" in /chosen/bootargs.
Hmm...
If you really need it, you can always add it to the U-Boot bootargs variable.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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