* How to read write PCI BAR memory address @ 2015-04-24 6:02 Anil Joshi 2015-04-24 8:01 ` Ricardo Ribalda Delgado 2015-04-24 8:45 ` Bjørn Mork 0 siblings, 2 replies; 3+ messages in thread From: Anil Joshi @ 2015-04-24 6:02 UTC (permalink / raw) To: kernelnewbies My PCI device information is as follows: Print Begin Configuration space... BAR 0 start address: f6000000 BAR 0 end address: f6ffffff BAR 0 flags: 140204 BAR 0 IO / MEM: MEM BAR 0 PREFETCH NON PREFETCH: NON-PREFETCH BAR 1 start address: 0 BAR 1 end address: 0 BAR 1 flags: 0 BAR 1 IO / MEM: MEM BAR 1 PREFETCH NON PREFETCH: NON-PREFETCH BAR 2 start address: f0000000 BAR 2 end address: f3ffffff BAR 2 flags: 14220c BAR 2 IO / MEM: MEM BAR 2 PREFETCH NON PREFETCH: PREFETCH I want to write a byte and read it back to BAR2 for a test simple . Is it possible to write a byte to BAR2 start address Sample code is welcomed. Regards -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20150424/ee153783/attachment.html ^ permalink raw reply [flat|nested] 3+ messages in thread
* How to read write PCI BAR memory address 2015-04-24 6:02 How to read write PCI BAR memory address Anil Joshi @ 2015-04-24 8:01 ` Ricardo Ribalda Delgado 2015-04-24 8:45 ` Bjørn Mork 1 sibling, 0 replies; 3+ messages in thread From: Ricardo Ribalda Delgado @ 2015-04-24 8:01 UTC (permalink / raw) To: kernelnewbies Hello On Fri, Apr 24, 2015 at 8:02 AM, Anil Joshi <aj27744@gmail.com> wrote: > > I want to write a byte and read it back to BAR2 for a test simple . Is it > possible to write a byte to BAR2 start address You could use /dev/mem mmap it with the required offset. Regards! ^ permalink raw reply [flat|nested] 3+ messages in thread
* How to read write PCI BAR memory address 2015-04-24 6:02 How to read write PCI BAR memory address Anil Joshi 2015-04-24 8:01 ` Ricardo Ribalda Delgado @ 2015-04-24 8:45 ` Bjørn Mork 1 sibling, 0 replies; 3+ messages in thread From: Bjørn Mork @ 2015-04-24 8:45 UTC (permalink / raw) To: kernelnewbies Anil Joshi <aj27744@gmail.com> writes: > My PCI device information is as follows: > > Print Begin Configuration space... > BAR 0 start address: f6000000 > BAR 0 end address: f6ffffff > BAR 0 flags: 140204 > BAR 0 IO / MEM: MEM > BAR 0 PREFETCH NON PREFETCH: NON-PREFETCH > BAR 1 start address: 0 > BAR 1 end address: 0 > BAR 1 flags: 0 > BAR 1 IO / MEM: MEM > BAR 1 PREFETCH NON PREFETCH: NON-PREFETCH > BAR 2 start address: f0000000 > BAR 2 end address: f3ffffff > BAR 2 flags: 14220c > BAR 2 IO / MEM: MEM > BAR 2 PREFETCH NON PREFETCH: PREFETCH > > I want to write a byte and read it back to BAR2 for a test simple . Is it > possible to write a byte to BAR2 start address > > > Sample code is welcomed. Linux export these resourses in sysfs. See See https://www.kernel.org/doc/Documentation/filesystems/sysfs-pci.txt Googling for these will get you some usage examples, like this one: http://billfarrow.blogspot.com/2010/09/userspace-access-to-pci-memory.html Bj?rn ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-04-24 8:45 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2015-04-24 6:02 How to read write PCI BAR memory address Anil Joshi 2015-04-24 8:01 ` Ricardo Ribalda Delgado 2015-04-24 8:45 ` Bjørn Mork
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).