Tomasz Motylewski wrote:
> If you look as asm/io.h you will see it is really very simple macro:
>
> #define __io_phys(x) ((unsigned long)(x) & ~PAGE_OFFSET)
> /*
> * Change virtual addresses to physical addresses and vv.
> * These are pretty trivial
> */
> extern inline unsigned long virt_to_phys(volatile void * address)
> {
> return __io_phys(address);
> }
>
>
Yes you're right ;
phys_to_virt add an offset of 0xc0000000
and virt_to_phys substract this offset.
It explains that the IO are remapped to the third Go
of address space.
And I thought that ioremap respect that but I'm
now thinking that I don't remap really IOs but Memory ...
Thanks.
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Kumsta Christophe
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Real-Time System developper
RT-Linux (RTAI) Use the Source Luck !
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