On Thu, Oct 17, 2013 at 4:58 PM, Ingo Jürgensmann <[email protected]>
wrote:
> [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/printk/printk.c:2233
> register_console+0x36/0x2b6()
> [ 0.000000] console 'debug0' already registered
> [ 0.000000] Kernel command line: root=/dev/sdb4 rw video=pal-lace
> devtmpfs.mount=1 debug=ser debug=mem
> I'm unsure about the kernel ooops at the beginning whether it comes from
> devtmpfs.mount=1 or not, but so far Akire booted and runs fine the last 20
> minutes.
"debug=ser" and "debug=mem" share the same struct console.
"debug=ser" does:
amiga_console_driver.write = amiga_serial_console_write;
register_console(&amiga_console_driver);
"debug=mem" does:
amiga_console_driver.write = amiga_mem_console_write;
register_console(&amiga_console_driver);
and then the core console code complains it's registered twice, so
it ignores the second one. Hence it's harmless (but the second one won't
work).
This is a relic from the old days, when we supported only one debug console.
Each debug console should use its own struct console.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
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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