> I wrote a simple program to access physical memory or memory mapped devices. In x86 systems which support 36 bit addressing, it is possible to IO devices to have > memory mapped above the 4GB >address range. I used the mmap64 call to try and access the range of addresses above 4GB but is seems that the bits above 31 in the > offset field is being ignored. I am using a modified 2.6.9 kernel which comes in the Red Hat enterprise distribution. Are you using a 64-bit OS? If yes, mmap will default to mmap64. If you are not on a 64-bit complaint OS, you'd need to open /dev/mem with open64. Could you post the relevant parts of the code here so that we may have a look at what might be going wrong? ./h -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
