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 Bjørn