On Thu, 21 Oct 2004 12:16:07 +0530, Thekkedath, Gopakumar > What i understood from your query was that, u want to access physical ^ The word missing above was "you", please refrain from "text message" speak :-) > address 0xfdf00000, and that is why i suggested ioremap, you can use > macros/functions like __va, or phys_to_virt only if there already 'EXISTS' > mappings for those physical addresses, are you sure you have one ?. It sounds like he does not and is slightly confused over what is carried across from the bootloader to the kernel. He needs to explicitly setup a mapping unless he is dealing with one of the non-standard ppc IO register regions, in which case there are genericish access functions as mentioned previously. Jon. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/