# Re: Accessing PCI-E resources on 460EX

- From: Felix Radensky \<hidden\>
- Date: 2008-12-01 11:08:45 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2008/12/9448758
- Thread: https://ratatoskr.run/linuxppc-dev/2008/11/9447899/t.md

```text
Benjamin Herrenschmidt wrote:
> On Mon, 2008-11-03 at 23:09 +0200, Felix Radensky wrote:
>   
>> Hi,
>>
>> I'm currently struggling with some application
>> that tries to access PCI-E memory by mmaping
>> address found in /sys/bus/pci/devices/<device>/resource
>>
>> mmap() fails with "invalid argument" error, apparently
>> because on 460EX PCI addresses are 36-bit.
>>
>> What is the correct way of accessing PCI-E from
>> userspace on this platform.
>>     
>
> I fixed a lot of these problems recently. Can you try again with
> 2.6.28-latest-rc ?
>   

Thanks a lot for this input.
The problem is that I have a custom board with quite a few kernel modifications,
and I'm afraid it can take me some time to move from 2.6.26 to 2.6.28.
Any chance I can backport you modifications to 2.6.26 ? Have you modified
other files except arch/powerpc/sysdev/ppc4xx_pci.c to fix these problems ?

> Cheers,
> Ben.
>
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>   
```