Break on serial port
I remeber a while back being able to send a break on serial console. I've been unable to do this under 2.4.17. Has this feature been turned off? Is there a way to turn it back on?
Thanks,
Chris
Quoted 3 lines · cfowler
I remeber a while back being able to send a break on serial console. I've been unable to do this under 2.4.17. Has this feature been turned off? Is there a way to turn it back on?
It works fine here. Please confirm that:
1. your kernel is built with CONFIG_MAGIC_SYSRQ
2. cat /proc/sys/kernel/sysrq returns '1'
3. the serial console port is being held open by some user program (eg, getty or init)
If any of the three above are not true, then break<sysrq-key> doesn't work.
Signature · 2 lines
Russell King ([email protected]) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html
I can not find that ocnfig option anywher in my 2.4.17 tree. I also added CONFIG_MAGIC_SYSRQ=y to the top of .config and then did a make dep and make bzImage. Upon boot I did not see a /proc/sys/kernel/sysrq
I did notice this feature in architectures other than i386.
Chris
Quoted 25 lines · Russell King
Quoted 3 lines · cfowler
I remeber a while back being able to send a break on serial console. I've been unable to do this under 2.4.17. Has this feature been turned off? Is there a way to turn it back on?
It works fine here. Please confirm that:
1. your kernel is built with
CONFIG_MAGIC_SYSRQ
2. cat/proc/sys/kernel/sysrqreturns '1'
3. the serial console port is being held open by some user program (eg, getty or init)If any of the three above are not true, then break<sysrq-key> doesn't work.
Signature · 8 lines
Russell King ([email protected]) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Quoted 3 lines · cfowler
I can not find that ocnfig option anywher in my 2.4.17 tree. I also added
CONFIG_MAGIC_SYSRQ=yto the top of .config and then did a make dep and make bzImage. Upon boot I did not see a/proc/sys/kernel/sysrq
Oops, sorry, you need to enable CONFIG_DEBUG_KERNEL as well.
Signature · 2 lines
Russell King ([email protected]) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html