[uClinux-dev] Kernel modules don't work on read-only filesystems ?

[Josue de Freitas]

On 10/11/07, David Wu <davidwu at arcturusnetworks.com> wrote:
>
> On Thu, 11 Oct 2007 09:30:26 -0400, Josue de Freitas
> <josue.freitas at gmail.com> wrote:
>
> > On 10/10/07, David Wu < davidwu at arcturusnetworks.com> wrote:
> >>
> >> On Wed, 10 Oct 2007 16:59:56 -0400, Josue de Freitas
> >> <josue.freitas at gmail.com> wrote:
> >>
> >> > On 10/10/07, Crane, Matthew <mcrane03 at harris.com> wrote:
> >> >>
> >> >>  Hi,
> >> >>
> >> >> Sounds like your module didn't actually get inserted.  Can you
> verify
> >> it
> >> >> is present with an lsmod?   If it failed to insert, then check your
> >> >> klog.
> >> >>
> >> >
> >> >
> >> > Yes it is up. It's very strange because it's up but seems not to be
> >> > running,
> >> > a simple "hello world" module using printk  also don't work, it gets
> >> up
> >> > but
> >> > apparently not run (damn my naivety to think that this will work :p).
>
> >> >
> >> > The scull module is suppose to create an proc dir entry called
> >> scullmem,
> >> > but
> >> > it's not created.
> >> Did you do a strip on the module? If yes then try not strip.
> >
> >
> >
> > I never wonder if this have any influence... but it's not-stripped:
> >
> > # file scull.o
> > scull.o: ELF 32-bit MSB relocatable, version 1 (SYSV), not stripped
> This doesn't show if it is stripped. try list the size of your module in
> the kernel tree and on the target.



The module is build with those commands:

mb-gcc -D__KERNEL__ -I/root/uClinux/cvs/uClinux-2.4.x/include  -Wall
-Wstrict-prototypes -Wno-trigraphs -O1 -g -fno-strict-aliasing -fno-common
-fno-builtin-sprintf  -DPLATFORM=uclinux-auto -O2 -fno-builtin -DNO_MM
-DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__
-I/root/uClinux/microblaze-elf-tools/bin/../lib/gcc/microblaze/3.4.1/./include
-mxl-soft-div -mno-xl-soft-mul -mxl-pattern-compare -DMODULE   -nostdinc
-iwithprefix include -DKBUILD_BASENAME=main  -c -o main.o main.c

mb-gcc -D__KERNEL__ -I/root/uClinux/cvs/uClinux-2.4.x/include  -Wall
-Wstrict-prototypes -Wno-trigraphs -O1 -g -fno-strict-aliasing -fno-common
-fno-builtin-sprintf  -DPLATFORM=uclinux-auto -O2 -fno-builtin -DNO_MM
-DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__
-I/root/uClinux/microblaze-elf-tools/bin/../lib/gcc/microblaze/3.4.1/./include
-mxl-soft-div -mno-xl-soft-mul -mxl-pattern-compare -DMODULE   -nostdinc
-iwithprefix include -DKBUILD_BASENAME=access  -c -o access.o access.c

mb-gcc -D__KERNEL__ -I/root/uClinux/cvs/uClinux-2.4.x/include  -Wall
-Wstrict-prototypes -Wno-trigraphs -O1 -g -fno-strict-aliasing -fno-common
-fno-builtin-sprintf  -DPLATFORM=uclinux-auto -O2 -fno-builtin -DNO_MM
-DNO_FPU -D__ELF__ -DMAGIC_ROM_PTR -D__linux__
-I/root/uClinux/microblaze-elf-tools/bin/../lib/gcc/microblaze/3.4.1/./include
-mxl-soft-div -mno-xl-soft-mul -mxl-pattern-compare -DMODULE   -nostdinc
-iwithprefix include -DKBUILD_BASENAME=pipe  -c -o pipe.o pipe.c

mb-ld -r -o scull.o main.o access.o pipe.o


on the target board I have:

# ls -l
-rw-r--r--    1 root     0           19988 Jan  1 00:00 scull.o

and on my computer I have:

Gmicro3-278:~/uClinux/cvs/uClinux-dist/linux-2.4.x/drivers/char/scull# ls -l
scull.o
-rw-r--r-- 1 root root 335835 2007-10-11 11:07 scull.o


The different size mean that... ?


BTW. what do you have in /proc/sys/kernel/printk ?



I do and "echo 8 > /proc/sys/kernel/printk"... Also don't work.

By default I have:

# cat /proc/sys/kernel/printk
15      4       1       7


Thanks again David.

Regards, Josue.
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