Seems like I found problem. Look ret = io_remap_page_range(start, offset, size, vma->vm_page_prot); remaps from "offset" which I got from pci_resource_start (curdev, IOMEM0); its ok from first board where it eq 0x40000000 but on second it 0x40002040 Then I'm reading from x = mmap (NULL, MMAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); with shift 0x3C>>2 where I expect board register. But for second board x points to where? 0x40000000 or 0x40002040 or as I think remap_page_range or sonething realign offset to PAGE so x points to 0x40002000 or 0x40003000 and reading with shift 0x3C have no sense. Am I rigth?
