From: Marc SCHAEFER <schaefer@alphanet.ch>
To: kernelnewbies@kernelnewbies.org
Subject: Re: Does sysrq work over USB?
Date: Sun, 21 Nov 2021 21:49:16 +0100 [thread overview]
Message-ID: <20211121204915.GA14247@alphanet.ch> (raw)
In-Reply-To: <YZqK5V2NDv8cuyMU@valentin-vidic.from.hr>
Hello,
On Sun, Nov 21, 2021 at 07:07:33PM +0100, Valentin Vidi?? wrote:
> I tried and it doesn't work for me either, but the problem is most
> likely missing CONFIG_USB_SERIAL_CONSOLE=y option in the kernel build:
>
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=868352
Yes,
with a kernel recompiled with those options and grub configured,
I get:
CONFIG_USB=y
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_CONSOLE=y
CONFIG_U_SERIAL_CONSOLE=y
I get:
root@gluster-1:~# cat /proc/consoles
tty0 -WU (EC p ) 4:1
ttyUSB0 -W- (E p ) 188:0
and I can then do sysrq from USB:
schaefer@acer-1:~$ cu -l ttyUSB0 -s 9600
Connected.
~%break
[ 1633.701624] sysrq: HELP : loglevel(0-9) reboot(b) crash(c)
terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i)
thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l)
show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p)
show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u)
force-fb(V) show-blocked-tasks(w) dump-ftrace-buffer(z)
Thank you for your help: I have now a way to make it work.
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prev parent reply other threads:[~2021-11-21 20:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 14:04 Does sysrq work over USB? Marc SCHAEFER
2021-11-16 21:29 ` Valentin Vidić
2021-11-21 15:47 ` Marc SCHAEFER
2021-11-21 17:51 ` Valentin Vidić
2021-11-21 18:07 ` Valentin Vidić
2021-11-21 20:49 ` Marc SCHAEFER [this message]
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