Hi list, I was wondering that if a machine has 4 GB of physical RAM, then how will the devices map their registers to memory? So if a device maps its registers in say memory address X, then will that particular physical memory become inaccessible to the system? Thanks, Rajat - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs