read PCI memory and config spyce through /dev/mem

[Warlich, Christof]

Hi,

I'd like to look at some of my PCI devices through /dev/mem.
My kernel config has "Filter access to /dev/mem" (STRICT_DEVMEM)
switched off, so as root, I should have unrestricted access.

I get my PCI device's BAR address through /proc/iomem, e.g.:

$ cat /proc/iomem
...
    f7600000-f7603fff : r8169
...

Ok, so there should be 16K of PCI memory from my ethernet card
starting at f7600000, which is 4150263808 in decimal to be used
With dd. But:

$ dd if=/dev/mem bs=1 count=1024 skip=4150263808
dd: reading `/dev/mem': Bad address
0+0 records in
0+0 records out
0 bytes (0 B) copied, 6.6658e-05 s, 0.0 kB/s

The kernel config help says that _PCI_ memory access is even
possible with STRICT_DEVMEM enabled. Can anyone give me a hint
what I may do wrong?

Thanks a lot,

Chris