I/O port access ???

[Geert Uytterhoeven]

On Thu, 4 Feb 1999, Gerd Knorr wrote:
> On Thu, 4 Feb 1999, Geert Uytterhoeven wrote:
> > On Thu, 4 Feb 1999, Gerd Knorr wrote:
> > > Is there some way to access the I/O ports, for example the VGA registers
> > > of some graphics board (assuming the I/O ports are enabled in the PCI
> > > config space) on ppc boxes?  How can I do that with Linux?  From kernel
> > > space?  From user space?
> > 
> > You have to mmap() /dev/mem. Which address depends on the type of PPC box.
> > You can find the correct addres in <asm/io.h> (*_ISA_IO_BASE).
> 
> Can I easily figure out the machine type (at runtime) somehow?  Parse 
> /proc/cpuinfo?

Currently that's the only solution.

Maybe you remember I talked about /proc/bus/isa on linux-kernel some time
ago? Now you know why...

Greetings,

						Geert

--
Geert Uytterhoeven                     Geert.Uytterhoeven at cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP}  http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium


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