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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!agate!library.ucla.edu!psgrain!news.tek.com!news!phils From: phils@tv.tek.com (Phil Staub) Newsgroups: comp.os.386bsd.questions Subject: Re: SIO/COM driver 16550A limitations? Date: 09 Jul 1994 17:44:54 GMT Organization: Tektronix TV Products Lines: 39 Message-ID: <PHILS.94Jul9104454@satori.tv.tek.com> References: <1994Jul4.130216.19263@bruce.cs.monash.edu.au> <PHILS.94Jul7114917@satori.tv.tek.com> <1994Jul8.130349.11260@cm.cf.ac.uk> NNTP-Posting-Host: satori.tv.tek.com In-reply-to: paul@isl-gate.elsy.cf.ac.uk's message of Fri, 8 Jul 1994 13:03:47 +0000 In article <1994Jul8.130349.11260@cm.cf.ac.uk> paul@isl-gate.elsy.cf.ac.uk (Paul) writes: [ previous discussion deleted ] > > Do you have an SMC chip on your board? There's a lot of these around and Not sure. Very possible, but the chip is covered with a sticker that I didn't bother to lift. Probably should do this. > they have a nasty bug that causes a lockup when you try to enable the > FIFO. Since the interrupt level is raised when trying to open the serial > port this causes a total lockup of the machine and generally results in > a inconsistent filesystem (although I've never seen it in such a state that > it won;t get fixed at boot). I have. It forced a re-load to get things consistent again. > > Anyway, we've been playing around with a fix in FreeBSD ad we have one that > works but we're still looking at exactly what's happening. It's a pity > the fix we had didn't get into 1.1.5, I did suggest that it should! > > Here's a fix from Christian that solved the problem for me but there > seems to be more to the story than this so we're still looking into > the correct fix. This fix also worked for me. I haven't spent much time figuring out what it does, but as long as it does the trick, I'm satisfied for now. [ patch deleted ] > -- > Paul Richards, FreeBSD core team member. > Intelligent Systems Laboratory, ELSYM ,University of Wales, College Cardiff > Internet: paul@isl.cf.ac.uk, JANET(UK): RICHARDSDP@CARDIFF.AC.UK Thanks, Paul. Phil -- ------------------------------------------------------------------------------ Phil Staub, phils@tv.tv.tek.com Tektronix Television Division (503) 627-6910