Date: Thu, 1 Feb 1996 14:52:11 -0600 (CST) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: phk@critter.tfs.com (Poul-Henning Kamp) Cc: jgreco@brasil.moneng.mei.com, jkh@time.cdrom.com, dgy@rtd.com, freebsd-hackers@freefall.freebsd.org Subject: Re: Watchdog timers (was: Re: Multi-Port Async Cards) Message-ID: <199602012052.OAA09429@brasil.moneng.mei.com> In-Reply-To: <821.823206128@critter.tfs.com> from "Poul-Henning Kamp" at Feb 1, 96 09:22:08 pm
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> > I get the feeling I was barking up the right tree to begin with, but just > > didn't take it far enough. Take a PC card. Stick a microprocessor on it > > with two serial ports. Connect a 16450 to the PC bus as COM1:, and hard > > wire it to one of the uP's serial ports. You have "serial console" > > capability within FreeBSD. Connect an output line from the uP to the PC's > > reset line. And decode one or two I/O locations and make them available to > > the uP. > > > > Now: you can use the I/O location(s) to control a basic, easy-to-program > > watchdog function running on the uP. In addition, you can connect a modem > > (/terminal/whatever) to the uP's other serial port. You could password > > protect access, which would be handy for remote sites. Once connected, > > the port could just be a pass-thru to the other port, but you could use > > BREAK or some other escape sequence to get access to other functions: > > > > Well, the one feature I miss from this is this: > Add (BIOS-extension) Eprom which redirects all output to the > screen so that it can be used on a remote console too. (Think > "bios-setup" here...) Yes, I agree, but I have no idea whether this is do-able, feasible, or even possible. I'd certainly like that though. ... JG
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