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Newsgroups: comp.os.386bsd.development Path: sserve!newshost.anu.edu.au!munnari.oz.au!yoyo.aarnet.edu.au!news.adelaide.edu.au!news.cs.su.oz.au!harbinger.cc.monash.edu.au!msuinfo!agate!usenet.ins.cwru.edu!news.csuohio.edu!stever From: stever@csuohio.edu (Steve Ratliff) Subject: Re: Pointers on drivers for multiport serial boards. Message-ID: <1994Apr1.050158.4998@news.csuohio.edu> Sender: news@news.csuohio.edu (USENET News System) Organization: Cleveland State University X-Newsreader: Tin 1.1 PL5 References: <2nauud$g2i@taco.cc.ncsu.edu> Date: Fri, 1 Apr 1994 05:01:58 GMT Lines: 25 CHRISTOPHER D DUKES (cddukes@eos.ncsu.edu) wrote: : I have recently aquired enough diskspace that I can contemplate : poking around inside the kernel of a free Unix flavor or two. : As I have a few RT PC 8 port serial cards with okay hardware : documentation I am contemplating seeing if I can write an appropriate : driver so that it can be supported (Probably with a bit of : surgery on the card). Where can I find some good tips on going : through the specifications of registers on the card to working : on a driver? : For that matter where can I get some tips on writing a device : driver for FreeBSD? (Outside of 68000 assembler this is my : first attempt at writing a device driver). : : Thanks. If these are multiports from an IBM PC RT, then I believe this has already been done for 386bsd with the old CGD multiport/bidir com.c driver and also possibly with the original sio.c driver. Check the news archives around the April/May of 1993 time period. I think it was either a Bob Wilcox or Gene Stark that did them. My excuses to either or both of them if this is incorrect. I have a hard enough time remembering what I had for breakfast yesterday, let alone news articles from a year ago. ;) Check the old news articles for the correct info and patches. Steve