outb()

Altera_Forum · ‎05-08-2005

Hello,

Can anyone help me with this simple issue?

how to compile such simple test:

# include <sys/io.h>

int main(void)

{

ioperm(0x340,0x342,1);

outb(0x340,0x0);

exit(0);

}

there are no outb() function declared in headers....

Altera_Forum · ‎05-08-2005

Hello,

outb/ioperm, etc. have no meaning in uCLinux, since it's designed specifically for MMUless processors.

I believe that the IORD/IOWR macros will work, just fine, for you. They can be found @:

# include <io.h>

Cheers,

- slacker

Altera_Forum · ‎05-10-2005

Hello slacker,

I'd like to know if there is a tutorial where I can find the syntax of macros such as IORD or IOWR. If there aren't any, how can you rewrite aj_'s small program?

thanks.

Altera_Forum · ‎05-11-2005

Hello every body,

I'm sure that someone has already cope with these kind of programs...

Regards

Altera_Forum · ‎05-11-2005

It is indeed possible to use outb() and similar in userspace by including <asm/io.h>, or at least it should be.

As far as I remember all the code in asm/io.h is inside# ifdef __KERNEL__, so you have to do some adjustments to this file to be able to access the IO-functions from userspace (refer to f.ex i386).