Re: Help with some low level access

[Ross Vumbaca <rossv1@optushome.com.au>]

Hi,

Geert Uytterhoeven wrote:

> > O.k the inb and outb is fine now, but I get this weird (link) problem:

> > /sio.c:46: undefined reference to `local symbols in discarded section 
> > .fixup'
> > /sio.c:46: undefined reference to `local symbols in discarded section 
> > .fixup'
> > /sio.c:46: undefined reference to `local symbols in discarded section 
> > .fixup'
> > /sio.c:46: undefined reference to `local symbols in discarded section 
> > .fixup'
> > /sio.c:47: undefined reference to `local symbols in discarded section 
> > .fixup'
> > /tmp/ccq1O4nL.o:/sio.c:48: more undefined references to `local symbols 
> > in discarded section .fixup' follow
> >
> > (Similar story with my program:)
>
>
> Alternatively, define your own inb() and friends, based on the definitions in
> <asm/io.h>.

O.k, by simply copying the inb() definition from asm/io.h and putting it 
in my program, like so:

#include <stdio.h>
#define __KERNEL__
#include <asm/io.h>

#define _IO_BASE        isa_io_base
#define inb(port)       in_8((u8 *)((port)+_IO_BASE))

unsigned long isa_io_base = 0xfe000000;

int main() {
//      ioperm(0x00, 0xff, 1);
        printf ("Status register: %x\n", inb(0x08));
        return 0;
}

it will build! (It's beyond my knowledge why that has made a 
difference). I get a segafault of course, since I am running in user 
space, but at least it is appears to be making progress. Thanks for the 
help.

Now just need to try and get ioperm().

Regards,

Ross..