Messages in this thread | | | Date | Tue, 20 Mar 2012 21:17:00 +0100 | From | "Hans J. Koch" <> | Subject | Re: uio_pci_generic driver |
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On Tue, Mar 20, 2012 at 10:48:25PM +0400, tochansky@tochlab.net wrote: > > On Tue, Mar 20, 2012 at 09:56:03PM +0400, tochansky@tochlab.net wrote: > >> Hello! > >> I have a question about uio_pci_generic driver. I'm trying to use it in > >> my > >> project, but have no luck. > >> There are very little information on the subject. If you have a few > >> minutes, I would like to ask a few questions. > >> I need to mmap() memory of my board to work with it. I did > >> # modprobe uio_pci_generic > >> # echo "xxxx xxxx" > /sys/bus/pci/drivers/uio_pci_generic/new_id > >> > >> Files in /sys/class/uio/uio0 appears, but there no directory named > >> /sys/class/uio/uio0/maps/. > >> Anyway I tryed to mmap with code: > >> > >> #include <sys/types.h> > >> #include <sys/stat.h> > >> #include <fcntl.h> > >> > >> #include <sys/mman.h> > >> #include <stdio.h> > >> > >> int main() > >> { > >> int fd = open("/dev/uio0", O_RDWR | O_SYNC); > >> printf("fd = %d\n", fd); > >> void *addr = mmap(NULL, 1024, PROT_READ, MAP_SHARED, fd, 0); > >> printf("addr = %p\n", addr); > >> } > >> > >> Ofcourse, mmap() failes with error "Invalid argument". Nothing criminal > >> in > >> dmesg and any other hints of error. > >> > >> -- > >> Dmitriy > > > > > > Map memory through /sys/bus/pci/devices/...... > > > > Also copy questions to mailing lists please. > > > Thanks, it works now. > > #include <sys/types.h> > #include <sys/stat.h> > #include <fcntl.h> > > #include <sys/mman.h> > #include <stdio.h> > > int main() { > int fd = > open("/sys/class/pci_bus/0000:03/device/0000:03:00.0/resource5", > O_RDWR | O_SYNC); > printf("fd = %d\n", fd); > void *addr = mmap(NULL, 512, PROT_READ, MAP_SHARED, fd, 0); > if(addr == MAP_FAILED) { > perror("mmap"); > } > else { > printf("addr = %p\n", addr); > } > } > > May be its time to add some hints in documentation? :-)
Good idea. Michael, are you in the mood to hack something up for Documentation/DocBook/uio-howto.tmpl ?
Thanks, Hans
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