Hi, > > I am trying to develop a codec driver (rtlinux > driver) from scratch. In Viper board (PXA255) > physical memory range 0x40000000-0x43FFFFFF is used > by the PXA255 peripherals.In that address range > 0x40500000-0x405005FC is needed for AC'97 controller > registers. Is this memory range is already mapped to > virtual address space, else How to map this to > virtual address space. > You have to map this address range using "ioremap()". Data at address returned by ioremap can be accessed by calling readl(), writel() et al > > When i tried ioremap() it is giving same virtual > address with different physical address(i tried > ioremap with another driver(same board)with different > physical memory address) > Same virtual address can point to different physical addresses depending upon how it is mapped. Nitin -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
