Messages in this thread | | | Date | Wed, 16 Jan 2002 15:29:53 +0100 | From | Eric Lamarque <> | Subject | Re: serial console and kernel 2.4 |
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From: christophe barbé (christophe.barbe@lineo.fr) Date: Mon Jul 30 2001 - 09:54:53 EST > I recently upgraded a linux box to the kernel 2.4.4 . > Since the upgrade I can see the boot output on the remote console > but I can't use the keyboard
It seems that I experiment the same problem: I've some Compaq machine that I control remotely with the serial console.
It always runs 2.4.x kernel and all runs fine.
I just replace the machine by a newer one and experiment the same problem as you. It seems to me that Linux send CTRL-S on the serial line.
To check that this is the real problem, I use rlogin to access the machine and send CTRL-Q to the Linux console: it does the trick. ( # echo -e "\021" > /dev/console )
I trace the problem to be the arch/i386/kernel/dmi_scan.c function: DMI is a set of structures to get information about the machine. It is the one that print "Board Version:.." at boot time.
I'll check at http://www.ibm.com/products/surepath/other/smbios.html to know the type of such data. "Board Version" must be a string (I assume with printable character).
My problem is that "Board Version" is printed as "Board Version: 0x14 0x13 *." where 0x13 is CTRL-S.
Does the kernel contains a mechanism to avoid console printing of DMI information? (If not, we could maybe add it in function dmi_scan.c:dmi_save_ident()).
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