Date: Fri, 12 May 2000 13:31:59 -0400 (EDT) From: "Chris D. Faulhaber" <jedgar@fxp.org> To: Warner Losh <imp@village.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: BROKEN_KEYBOARD_RESET Message-ID: <Pine.BSF.4.10.10005121329530.82362-100000@pawn.primelocation.net> In-Reply-To: <200005121728.LAA12536@harmony.village.org>
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On Fri, 12 May 2000, Warner Losh wrote: > In message <200005121429.EAA13692@mauibuilt.com> FreeBSD MAIL writes: > : Is this the kernel setting to dislable ctrl-alt-delete from resetting > : a systtem? If so it seems to be broken in 4.0-RELEASE. > : is there another way of doing this? remaping keyboard perhaps? > : > : # BROKEN_KEYBOARD_RESET disables the use of the keyboard controller to > : # reset the CPU for reboot. This is needed on some systems with broken > : # keyboard controllers. > > No. The hot key squence CAD will reboot the system. Or rather it > will cause the init process to get a signal that causes it to reboot > the system. > > BROKEN_KEYBOARD_RESET does something different. In the IBM PC and > newer compatible machines, the keyboard controller part is connected > to a lot of different things, including the reset line to the CPU. > Generally one can get a fairly clean reset of the CPU by telling the > keyboard controller micro controller to reset the CPU with a nice > pulse downt he reset line. Some keyboard controllers didn't think > this was important enough to get right, so they don't implement this > proplerly. These controllers are generally on the 386 and 486 class > of machines and some pentium laptops (exceptions to the rule exist) > where the keyboard controller was still a 8042 microcontroller > programmed to talk to the keyboard. > Since this has been brought up, any reason that BROKEN_KEYBOARD_RESET is not a recognized option (see kern/12927)? ----- Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org -------------------------------------------------------- FreeBSD: The Power To Serve - http://www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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