Do you mean that physical memory is NOT real memory? -----Original Message----- From: Lukas Ruf [mailto:ruf@xxxxxxxxx] Sent: Thursday, July 15, 2004 12:03 PM To: Lei Yang Cc: Kernel Newbies Subject: Re: Physical memory > Lei Yang <leiyang@xxxxxxxxxxxx> [2004-07-15 17:46]: > > Hey all, > > Have a very basic question here, but it is kind of annoying me. The > kernel virtual area ( 3-4GB in virtual address) maps to the first > 1GB of physical RAM. But it is so common that we only have a machine > of 256MB/512MB etc. What is going on? > I assume: - your machine has only 512MB of real memory. - the mapping, i.e. the address translation, is carried out by the memory management unit in accordance to the configuration page table directories. HTH. wbr, Lukas -- Lukas Ruf | Wanna know anything about raw | <http://www.lpr.ch> | IP? -> <http://www.rawip.org> | eMail Style Guide: <http://www.rawip.org/style.html>| -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
