using depmod and modprobe

["James R. Van Zandt" <jrv@vanzandt.mv.com>]

I'm trying to package a device driver I've written for the DoubleTalk
speech synthesizer, but I can't get depmod (and therefore modprobe) to
work.  

I have compiled the module (dtlk.o) for the current kernel.  I think I
included all the relevant compiler switches:

    gcc -g -O -Wstrict-prototypes -fomit-frame-pointer -malign-jumps=2
    -fno-strength-reduce -pipe -malign-loops=2 -malign-functions=2 -m486
    -D__KERNEL__ -DMODVERSIONS -DMODULE -DLINUX -D__GENKSYMS__
    -DCPU=`uname --machine|sed -e s/^i//` -c -o dtlk.o dtlk.c

I installed it into /lib/module/2.0.29/misc.  insmod installs the
module fine.  However, recording the module dependency information
does not work.  The usual command gives only an uninformative error
message:

    # depmod -a
    modprobe: error reading ELF header: No such file or directory

However, I think this is unrelated to dtlk.

Using strace, I find depmod was looking for ipv4.o:

    open("/lib/modules/2.0.29/misc/NET_MISC_MODULES", O_RDONLY) = 104
    fstat(104, {st_mode=S_IFREG|0644, st_size=7, ...}) = 0
    mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4011f000
    lseek(104, 0, SEEK_SET)                 = 0
    read(104, "ipv4.o\n", 4096)             = 7
    read(104, "", 4096)                     = 0
    write(2, "modprobe: ", 10)              = 10
    write(2, "error reading ELF header: No suc"..., 51) = 51

The only entry in misc/NET_MISC_MODULES is one for ipv4.o:

    /lib/modules/2.0.29/misc$ cat NET_MISC_MODULES
    ipv4.o
	
However, there is no file ipv4.o in the whole lib/modules directory
tree.  I don't know where that entry came from.  Should I delete the
whole file NET_MISC_MODULES?

Trying to record the dependency information explicitly for the dtlk
module also fails:

    # depmod -e dtlk.o
    dtlk.o: unresolved symbol(s)
    	    request_region
    	    schedule
    	    current_set
    	    unregister_chrdev
    	    release_region
    	    register_chrdev
    	    verify_area
    	    loops_per_sec
    	    check_region
    	    jiffies
    	    printk
    dtlk.o:

I did RTFM (the depmod(1) man page and
/usr/src/linux/Documentation/modules.txt).  I'd appreciate any suggestions.

                                 - Jim Van Zandt


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