Newbie question about accessing memory in kernel space

[Niklaus Giger]

Am Dienstag, 24. Mai 2005 22.31 schrieb Matt Porter:
> On Tue, May 24, 2005 at 09:19:28PM +0200, Niklaus Giger wrote:
> > Hi

> > Oops: kernel access of bad area, sig: 11 [#1]
>
> <snip>
>
> > What is wrong with my code?
>
> You mapped the device into user virtual address space.  The TLB
> replacement code is unable to load a TLB entry for a page outside
> of kernel space...so you crash.
>
> Don't use io_block_map()...it allows you to shoot yourself in the
> foot very easily (as you just witnessed). Use ioremap() to map
> your device.
ioremap() fixed my problem.

Thanks a lot for your help.

Best regards

Niklaus