serial console questions
I have a serial console set up so I can capture output from boot and any sysrq activity.
The problem I have is I can't seem to do sysrq keys from the serial connection. The sysrq docs say I need to send a "break". Isn't that just a CTRL-C ? This doesn't work. I have to physically do all sysrq keying from the physical machine. This means my serial console is nothing more than a fancy logger. I'd like to interactivally send all the sysrq key sequences from my serial connection. I'm use tip as my serial software from a Sun box... is that the problem? I suspect my terminal is the problem...
How do I use sysrq over a serial console?
Signature · 10 lines
Bryan Whitehead SysAdmin - JPL - Interferometry Systems and Technology Phone: 818 354 2903 [email protected] - To unsubscribe from this list: send the line "unsubscribe linux-newbie" 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.linux-learn.org/faqs
Quoted 3 lines · Bryan Whitehead
I have a serial console set up so I can capture output from boot and any sysrq activity.
The problem I have is I can't seem to do sysrq keys from the serial connection. The sysrq docs say I need to send a "break". Isn't that just a CTRL-C ?
No. At least, in the context of serial communications, BREAK has a different *usual* meaning. Real serial terminals have a special "BREAK" key that actually causes a brief interruption in the "carrier" signal on the data link (one VT100 reference says it this way: "A break condition is the occurrence of a continuous space on a communication line for greater than one character time").
I'm not familiar with tip, nor have I any experience with Sun hosts ... but I'd check tip's man page for specifics about how to execute a BREAK. There should be some special key combination specific to the terminal application to do this. (minicom, as an example, uses the sequence CRTL-A, F to send a BREAK ... but I just looked at an online man page for a FreeBSD version of tip, and I didn't see a way to do it ... so you *may* need to switch to a more capable terminal program.)
This in turn assumes that the sysrq docs use "break" in its old, standard sense. If by "the sysrq docs" you mean the file "sysrq.txt" included with Linux kernel Documentation, I'd read it as referring to these old-style BREAKs.
Quoted 3 lines
This doesn't work. I have to physically do all sysrq keying from the physical machine. This means my serial console is nothing more than a fancy logger. I'd like to interactivally send all the sysrq key sequences from my serial connection. I'm use tip as my serial software from a Sun box... is that the problem? I suspect my terminal is the problem...
How do I use sysrq over a serial console?
See above.
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