map iomem in linux_2_4_dev

[shaowei dai]

Hi, Sangmoon:

Thanks. I got it. We've to use io_block_mapping() followed by ioremap() to
map the physical address.

regards.

----- Original Message -----
From: "Sangmoon Kim" <dogoil at etinsys.com>
To: "shaowei dai" <dshaowei at rfnetech.com>;
<linuxppc-embedded at lists.linuxppc.org>
Sent: Monday, May 27, 2002 4:13 PM
Subject: Re: map iomem in linux_2_4_dev


> Hi, Shaowei:
>
> The parameter addr of ioremap is not a virtual address
> but a kind of physical address.
>
> Let us have a device at 0x78000000.
> We can change the address to 0xf0000000 by...
>  io_block_mapping(0xf0000000, 0x78000000, 0x08000000, _PAGE_IO);
> Than what is the return value of ioremap(0x78000000, 0x08000000)?
> That is 0xf0000000.
>
> The system changes the addresses of devices for various reason.
> We only know the original address.
> Than we can use the ioremap to get the changed address.
>
> -Sangmoon Kim-
>
>


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