Hello, I'm trying to read from mmapped PCI memory space on an alchemy board, but I can't get it to work. Here's the lspci output of the PCI card: bash-3.00# lspci -v 00:00.0 Class 0200: 168c:001b (rev 01) Subsystem: 168c:2063 Flags: bus master, medium devsel, latency 168, IRQ 9 Memory at 0000000040000000 (32-bit, non-prefetchable) [size=64K] Capabilities: [44] Power Management version 2 I used mmap on "/dev/mem" and "/sys/bus/pci/.../resource0", but I do not read the expected values using "*(volatile u32 *)mmap_addr" from that region. The value also changes from read to read. Reading from kernel space just work fine. Am I doing something illegal? Any idea why it does not work? TIA, Wolfgang.
