Hi Jhoney, > And Also how to conver the kernel virtual address to the > physical address as the DMA hardware sees only the physical addresses. You can use ioremap to get a virtual address that you can use to write to. unsigned long value = 0; unsigned char *buff = NULL; Say mem_addr contains memory/IO base address-0 from config space, extract only base address removing lower bits and then do: buff = ioremap (mem_addr, 0x40) value = readl (buff) On Mon, 22 Nov 2004 11:03:00 -0600, Curran, Dominic <dcurran@xxxxxx> wrote: > > To read/write to IO memory (PCI registers) use the readl()/writel() family. Before that shouldn't one remap to get a virtual address as shown above? Regards, K Shakthi ---------------------------------------------------------------------------------- K Shakthi Specsoft (Hexaware Technologies), ASIC Design Center http://www.geocities.com/shakthimaan ---------------------------------------------------------------------------------- -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
