Herrera-Bendezu, Luis wrote: > > >> -----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).
No, the target address is expressed in pages, the source in bytes. Jan -- Siemens AG, Corporate Technology, CT SE 2 Corporate Competence Center Embedded Linux _______________________________________________ Xenomai-core mailing list [email protected] https://mail.gna.org/listinfo/xenomai-core
