Are you working with a actual video card? If so what video card our you
working with? Are you familiar with fbcon ? This provides a standard
interface to mode setting video hardware. In fbcon we store both the
physical address and virtual address in a data structure (fb_info). The
physical address is what you get from the bus. Now each process has its
own virtual address space. Thats what mmap does. In order to do this you
need a ioremap function that maps the physical address to the virtual
address of the process. Usually that function is in a mmap function
defined for a driver.
"We've all heard that a million monkeys banging on a million typewriters
will eventually reproduce the entire works of Shakespeare. Now,
thanks to the Internet, we know this is not true. It made something
better, linux :)"
On Tue, 2 Nov 1999, Adam Meyerowitz wrote:
> Hello,
>
> Lets say I have a device (like a vga card), that maps its memory into the
> processor
> address space. Lets say the address is 0xe2000000. How can I write to
> that address
> from a rtlinux module. Can I simply assign a pointer to that address and
> write to
> it or do I have to do some other things?
>
> Thanks
> Adam
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