From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200105072049.f47Knh628959@stimpy.networkrobots.com> Date: Mon, 07 May 2001 13:56:08 -0700 To: Freddy Lugo , linuxppc-embedded@lists.linuxppc.org From: Paul White Subject: Re: Can not access memory after turning MMU on In-Reply-To: <20010507204100.56613.qmail@web9901.mail.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Hi Freddy, What address is it trying to address next? It needs to be sure its in the range of the BATS setup by initial_bats, which maps the first 16Meg of memory to KERNELBASE. After turning MMU on, it should finish relocating the kernel. Is this the part thats failing? I'm referencing arch/ppc/kernel/head.S above. Paul W. At 01:41 PM 5/7/2001 -0700, Freddy Lugo wrote: > >Hi, > >After turning the MMU (turn_on_mmu) the next memory >access instruction (stwu) can not be translated, the >memory can not be accessed and the system halt. I >check the list archives and there are references to >set the Debug Enable Register (DER) to an >"appropriate" value. I am working with the MPC750 and >in the Users Manual I can't find any reference to such >register. Also I checked my bdi2000 (in case it was a >register on the bdi) and I didn't found anything. > >This register exists or has its counterpart on the >MPC750? Besides the DER value, there are other >methods to work and find the problem? > >Thanks, > >Freddy Lugo > > ------------------------------------------------------------- Network Robots, Inc. /--\ Paul H. White / ____ \ 4695 Chabot Dr. #200 / ( oo ) \ Software Developer Pleasanton, CA 94588 / ---- \ Engineering (925) 924-8600 \ ---- / (925) 580-4883 \ V--V / \ / \--/ ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/