Honored ContributorI follow http://nioswiki.jot.com/wikihome/operating...duleprogarmming (http://nioswiki.jot.com/wikihome/operatingsystems/moduleprogarmming) but when I type in "modprobe hello" what I get is "modprobe could not parse modules.dep".
/lib/modules/modules.dep is empty, which could explain why it couldn't be parsed... I followed the instructions all the way. Any ideas where I could have gone wrong?
Honored Contributor
/lib/modules/modules.dep is empty, which could explain why it couldn't be parsed...
i followed the instructions all the way. any ideas where i could have gone wrong?
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--- Quote End --- modules.dep is the module dependency file. It only exists if you created module dependencies. If you build your module outside of the kernel tree your module won't be included. The good news: you can load your module with the insmod command. In the directory where your module is type: insmod hello.ko and you'll be flying!
Honored Contributorthe good news: you can load your module with the insmod command.
in the directory where your module is type: insmod hello.ko and you'll be flying!
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--- Quote End --- So the commands in the instructioncs don't make the dependencies? After "make menuconfig" it says I have to run "make dep" next, but when I do, it says that it's unnecessary now. Another problem: I can't find the module in uClinux, for some reason. What's the default location for it, if I've followed the instructions?
Honored Contributor"make menuconfig" it says i have to run "make dep" next, but when i do, it says that it's unnecessary now.
another problem: i can't find the module in uclinux, for some reason. what's the default location for it, if i've followed the instructions?
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--- Quote End --- In the 2.6 series the module dependencies are created when you run make modules_install. You probably shouldn't run that command (unless you know what you're doing). If you followed the huide your module will be in drivers/misc/hello.ko I don't want to question the way the examples works but I personally never write kernel modules INSIDE the kernel tree when developing them. I make a seperate directory with a makefile like:
# If KERNELRELEASE is defined, we've been invoked from the# kernel build system and can use its language.
ifneq ($(KERNELRELEASE),)
obj-m := hello.ko# Otherwise we were called directly from the command# line; invoke the kernel build system.
else
KERNELDIR = /usr/src/cross/linux-2.6.11
PWD := $(shell pwd)
default:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endifARCH=nios2nommu CROSS_COMPILE=nios2-linux-uclibc- makeSorry, I forget to add modules_install in the wiki.
It will install modules objects to romfs/lib/modules . Please run, in uClinux-dist-test dir, make make modules_install make linux image There is not need to run make dep in kernel 2.6 .Honored ContributorThanks to you both, hello.ko is now included!
But now I getinsmod: cannot insert `/lib/modules/2.6.16-uc0/kernel/drivers/misc/hello.ko': Invalid module format (-1): Exec format error
modprobe: failed to load module helloif ; then ../user/busybox/examples/depmod.pl -l vmlinux -ae -F System.map -b /root/uClinux-dist-test/romfs/lib/modules -r 2.6.16-uc0; fi
Unknown option: ae
Unknown option: rI had this problem before, but I can't recall if I had resolved it or not. Sorry.
I will check again, and let you know later. Please try compile module into kernel, without module loading.Honored Contributori will check again, and let you know later.
please try compile module into kernel, without module loading.
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--- Quote End --- I'm having this exact same problem ... Has anybody resolved the issue ?? Thanks in advance.
Honored ContributorHas anyone solved this one yet?
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--- Quote End --- I have made quite a few modules the way I described earlier outside of the kernel tree and it always worked (with the given Makefile). I'm not sure if it will work with the modprobe stuff. But if you use insmod it will work.
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--- Quote End --- Sort of... Discovered that mmap() is returning a NULL pointer during the module load. Seems that this comes from the call to ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); in do_mmap_private() in linux-2.6.x/mm/nommu.c If you comment out the whole if (vma->vm_file) {} block in do_mmap_private(), then the function will make a private copy and modules seem to insert ok. This seems like a big hack to me - I haven't worked out why the original isn't working, but i'm sleepy http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif Hope this helps someone to work out the real issue... Mike
