>-----Original Message-----
>From: Jan Kiszka [mailto:[email protected]]
>Sent: Tuesday, November 10, 2009 12:03 PM
>To: Herrera-Bendezu, Luis
>Cc: [email protected]
>Subject: Re: rtdm_iomap_to_user with phys addr > 4GB
>
>
>Herrera-Bendezu, Luis wrote:
>> Hello,
>>
>> I am writing an RTDM driver to replace one that uses UIO. The device
>> resides in a physical address > 4 GB on a PPC440EPx. The UIO could
>> not handle this address so I made a proposal to address it,
>details at:
>> http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-April/070097.html
>>
>> Function rtdm_iomap_to_user() has same issue with the physical I/O
>> address
>> unsigned long src_addr
>>
>> I am new to Xenomai and would like to get some ideas on how to solve
>> this
>> issue.
>
>I think UIO as well as RTDM suffers from the same problem here: The
>kernel service used to remap the physical memory (remap_pfn_range)
>accepts unsigned long, not phys_addr_t. How is this supposed to work?
>
>Jan
>
>--
>Siemens AG, Corporate Technology, CT SE 2
>Corporate Competence Center Embedded Linux
>
Actually, remap_pfn_range() gets passed the physical address left
shifted by PAGE_SIZE in both UIO and RTDM (xnarch_remap_io_page_range,
wrap_remap_io_page_range).
Luis
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