Messages in this thread | | | Subject | RE: Problem in module loading automatically at boot time | Date | Sat, 12 Jun 2004 14:15:00 +0530 | From | "Srinivas G." <> |
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Hi Johnson,
I tried with depmod -e option. It showed that printk is unresolved symbol. Is it current? Is it(printk) not a kernel symbol? If so, give me a suggestion.
Note: I included the <linux/kernel.h> and <linux/module.h> also. Please see the attachments.
Thanks and regards,
Srinivas G
-----Original Message----- From: Richard B. Johnson [mailto:root@chaos.analogic.com] Sent: Friday, June 11, 2004 10:29 PM To: Srinivas G. Cc: linux-kernel@vger.kernel.org; Surendra I.; Subramanyam B Subject: Re: Problem in module loading automatically at boot time
On Fri, 11 Jun 2004, Srinivas G. wrote:
> > Hi, > > I have written a small driver program called hello.c. > > ************************************************************************ > *************** > #include <linux/module.h> > > MODULE_LICENSE("GPL"); > > int init_module(void) > { > printk("<1>" "Hello world\n"); > return 0; > } > > void cleanup_module(void) > { > printk("<1>good bye\n"); > } > > ************************************************************************ > **************** > > I compiled the above program with cc -DMODULE -D__KERNEL__ > -I/usr/src/linux2.4/include -O2 -c hello.c > > I am using Red Hat Linux 7.3 with kernel version of 2.4.18-3. > It works fine when I load it with insmod from root prompt. > > Now, I want to make it load automatically at boot time. > For that I have used the following steps. > > ---> I copied the hello.o file in the > /lib/modules/2.4.18-3/kernel/drivers/block > > ---> I run the depmod command. It included the above path in > /lib/modules/2.4.18-3/modules.dep file. > > ---> I added "alias hello1 hello" entry into /etc/modules.conf file. > > When I reboot the machine after the above changes, my driver is not > loaded and an error message is printed as follows. > > ---> depmod: *** Unresolved symbols in > /lib/modules/2.4.18-3/kernel/drivers/block/hello.o > > > Could anyone suggest me, if I am missing anything here? > > Srinivas G >
Maybe `depmod -e ...` would tell you what symbols are missing??
Then, after you observe that, try including <linux/kernel.h>, and <linux/module.h>, like you are supposed to do.
Cheers, Dick Johnson Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips). Note 96.31% of all statistics are fiction.
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