Date: Mon, 13 Sep 1999 12:15:20 -0400 (EDT) From: Wayne Cuddy <wayne@crb-web.com> To: FreeBSD Hackers List <freebsd-hackers@FreeBSD.ORG> Subject: device driver interface Message-ID: <Pine.LNX.4.10.9909131204520.16008-100000@crb.crb-web.com>
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I am trying to understand how to integrate device drivers with the kernel. (this is my first crack at device drivers) I have a few books on device drivers but they are a little old and have a slightly different interface with the kernel than FreeBSD. I figured the best place to start would be to try to building one of the samples. So did I did >/usr/share/examples/drivers/make_device_drivers.sh WDC. The script will attempt to build the kernel and I get the following errors: cc -c -O -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wuninitialized -Wformat -Wunused -fformat-extensions -ansi -nostdinc -I- -I. -I../.. -I/usr/include -DKERNEL -DVM_STACK -include opt_global.h -elf ../../i386/isa/WCD.c ../../i386/isa/WCD.c: In function `WCDattach': ../../i386/isa/WCD.c:137: `WCDintr' undeclared (first use this function) ../../i386/isa/WCD.c:137: (Each undeclared identifier is reported only once ../../i386/isa/WCD.c:137: for each function it appears in.) ../../i386/isa/WCD.c: At top level: ../../i386/isa/WCD.c:177: `WCDintr' used prior to declaration ../../i386/isa/WCD.c: In function `WCDintr': ../../i386/isa/WCD.c:178: warning: unused variable `scp' ../../i386/isa/WCD.c: At top level: ../../i386/isa/WCD.c:188: conflicting types for `WCDioctl' ../../i386/isa/WCD.c:30: previous declaration of `WCDioctl' ../../i386/isa/WCD.c: In function `WCDclose': ../../i386/isa/WCD.c:226: warning: unused variable `scp' ../../i386/isa/WCD.c: In function `WCDread': ../../i386/isa/WCD.c:250: dereferencing pointer to incomplete type ../../sys/libkern.h:57: warning: inlining failed in call to `min' ../../i386/isa/WCD.c:250: warning: called from here ../../i386/isa/WCD.c:251: warning: implicit declaration of function `uiomove' ../../i386/isa/WCD.c: In function `WCDwrite': ../../i386/isa/WCD.c:267: dereferencing pointer to incomplete type ../../i386/isa/WCD.c: At top level: ../../i386/isa/WCD.c:273: conflicting types for `WCDmmap' ../../i386/isa/WCD.c:31: previous declaration of `WCDmmap' ../../i386/isa/WCD.c: In function `WCDmmap': ../../i386/isa/WCD.c:275: warning: unused variable `scp' ../../i386/isa/WCD.c: In function `WCDpoll': ../../i386/isa/WCD.c:296: warning: unused variable `scp' ../../i386/isa/WCD.c: At top level: ../../i386/isa/WCD.c:177: warning: `WCDintr' defined but not used *** Error code 1 Why does this fail? This script was installed of off my 3.2 cd set. Does anyone know of an existing driver that would be a good place to start for a newbie to understand these things? Any and all help is appreciated, Wayne To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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