Date: Thu, 01 Feb 1996 21:22:08 +0100 From: Poul-Henning Kamp <phk@critter.tfs.com> To: Joe Greco <jgreco@brasil.moneng.mei.com> Cc: jkh@time.cdrom.com (Jordan K. Hubbard), dgy@rtd.com, freebsd-hackers@freefall.freebsd.org Subject: Re: Watchdog timers (was: Re: Multi-Port Async Cards) Message-ID: <821.823206128@critter.tfs.com> In-Reply-To: Your message of "Thu, 01 Feb 1996 10:30:11 CST." <199602011630.KAA08895@brasil.moneng.mei.com>
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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...) -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@ref.tfs.com TRW Financial Systems, Inc. Future will arrive by its own means, progress not so.
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