Hello ,
you have to write
int init_module(void)
instead of main(). Also you have to create only object
file instead of executable file . Then using
$insmod module.o
you have to insert your .o file in the kernel . when you will insert it in
the kernel init_module () will automatically execute .
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VIJAY PATEL VMAIL:(91) (02712) 69001
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On Mon, 16 Nov 1998, [ks_c_5601-1987] ���缺 wrote:
> I'm novice at linux low level programming. Would you like to help me..?
>
> I hope to access my memory-mapped based ISA Card. From several news group articles,
>I got to know that it is needed to use functions as ioremap(), readb(), writeb()....
>
> so , I wrote my sample code for reading&writing the registers of my memory mapped
>ISA Card. but.. I always faild to link.
>
> my code & error message is as follows..
> Can you give me a comment and good solution..?
>
> #include <asm/io.h>
>
> void main()
> {
> unsigned long addr;
> unsigned long size;
> unsigned char readbyte;
>
> addr = 0xd6000;
> size = 4095;
>
> ioremap(addr,size);
> readbyte=readb(addr);
> }
>
> >> gcc -o memiotest memiotest.c
>
> memiotest.c: In function `main':
> memiotest.c:4: warning: return type of `main' is not `int'
> /tmp/ccrVq7Af.o: In function `main':
> /tmp/ccrVq7Af.o(.text+0x1d): undefined reference to `ioremap'
> /tmp/ccrVq7Af.o(.text+0x29): undefined reference to `readb'
> collect2: ld returned 1 exit status
>
>
> >> gcc -D__KERNEL__ -o memiotest memiotest.c
>
> memiotest.c: In function `main':
> memiotest.c:4: warning: return type of `main' is not `int'
> /tmp/ccHR1coE.o: In function `main':
> /tmp/ccHR1coE.o(.text+0x1d): undefined reference to `ioremap'
> collect2: ld returned 1 exit status
>
>
>
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