Date: Thu, 31 Oct 1996 11:16:56 -0600 From: "Eric L. Hernes" <erich@lodgenet.com> To: "Allen W. Gambert" <gambert@cftnet.com> Cc: hackers@FreeBSD.ORG Subject: Re: problems with device driver Message-ID: <199610311717.LAA06956@jake.lodgenet.com> In-Reply-To: Your message of "Thu, 31 Oct 1996 10:45:45 EST." <Pine.SUN.3.91.961031102600.16037D-100000@renoir.cftnet.com>
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"Allen W. Gambert" writes: >I've checked the majors.i386 file and decided to use major device number >77, the last free entry in that file. After creating the device nodes I >use kermit to try to open the device. I keep getting 'Sorry, can't open >connection: /dev/mb0: Device not configured'. I believe this is caused >by the open routine returning 'ENXIO'. The problem is the kernel is not >calling my open routine but instead some other open routine. I know its >not calling my open routine because its not printing out the printf's >i've placed at the beginning of 'mbopen'. 2.1* or -current. Under 2.1* you've got to edit sys/i386/i386/conf.c and add an entry to the cdev switch, in the 77th slot if that's your major number. Under -current, you've got to add the cdevsw[] entry to your driver and call cdevsw_add() somewhere in your probe or attach, probably attach. you can test basic open/close/read/write/ioctl straight from the shell by: open: $ exec 9>/dev/mydev close: $ exec 9>&- read: (and open/close) $ cat /dev/mydev write: (and open/close) $ cat somefile >/dev/mydev ioctl: $ stty </dev/mydev > >My question is what can I do to determine why my open routine is not >being called but instead some other open routine is being called? I must be >over looking something, but I just cant seem to figure out what. If >someone can point me in the right direction I would greatly appreciate it. > install the devsw entries. >Also. I was hoping to make this device driver an lkm instead of hard >coding it into the kernel. The only problem is I cant seem to find any >documentation on lkm other than the man pages. Does anyone know where I >might be able to find some documentation on lkm? > have a look-see at http://www.freebsd.org/~erich/ddwg.html (or thereabouts), its sparse and a little (lot) out of date, but it should get you going. >Thanks for you help. > >Allen > g'luck, eric. -- erich@lodgenet.com http://rrnet.com/~erich erich@rrnet.com
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