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Re: Help with some low level access


I'm not anywhere near an expert on this, so take what I say with a pound
of salt or so ... :)  I was reading up on the PCI specifications to try
to understand a little bit about drivers, and it was mentioned that the
x86 architecture use I/O space to access devices, whereas with PowerPC
systems, everything is accessed through memory space mapping ...

Hope that helps ...


On Tue, 4 Feb 2003, Ross Vumbaca wrote:

> I'm was trying to "debug" a problem with a driver and my PowerPC board,
> and I wrote this simple program which works fine on an x86 Debian Woody
> box (and does not use x86 dependent functions as far as I can tell):
> #include <stdio.h>
> #include <sys/io.h>
> int main() {
>          ioperm(0x00, 0xff, 1);
>          printf ("Status register: %x\n", inb(0x08));
>          return 0;
> }
> It seems that sys/io does not exist (using Debian Woody/PowerPC).
> I've searched around, but I can't find ioperm here, or inb even (except
> in the kernel), Probably this is a really dumb question, I'm a newbie to
> this - can anyone tell me what I'm doing wrong, or if I'm doing
> something really dumb.. (Is it possible even to use something like that
> on PowerPC? It works on the x86)..

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