From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Jin Date: Tue, 27 Jul 2004 18:36:24 -0700 Subject: [U-Boot-Users] ARM946, u-boot and linux In-Reply-To: <20040727220032.B4494C109F@atlas.denx.de> References: <20040727220032.B4494C109F@atlas.denx.de> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Wolfgang, On Wed, 28 Jul 2004 00:00:27 +0200, Wolfgang Denk wrote: > > 1. uclinux or linux? > > Let's rephrase it: the only chance you have on a MMU-less system is > by using uCLinux. For standard Linux a working MMU is mandatory. > > Note that it seens that uCLinux has already been ported to the > ARM946. Thanks. Now I know what I need to focus. > > 2. Boot loader? > > with MMU, such as 926. Or more general question: does u-boot support > > processors without MMU? From my ppc experience I know MMU is enabled > > on u-boot. > > And you are wrong: U-Boot does NOT use the MMU on PPC. [At least not > on all processors, and if then not for virtual memory but just to > play dirt^H^H^H^Hclever tricks with the data cache.] Oh. I see. Enabling MMU on PPC is just some dirt & clever tricks with the data cache. I saw the code to enable MMU in start.S. Hmmm...maybe a bit detail is more helpful to understand why MMU is enabled. Maybe I need to go back to the processor's user guide. > > Does ELDK support ARM946? ELDK supports arm920. ELDK can be used for > > arm946 if its core is compatible with arm920's. If ELDK doesn't > > You can use the cross toolchain, but the ative target tools will of > course not run as they require a standard Linux kernel, not uCLinux. ?? What target tools are you talking about? I thought the target tools refer to cross compiler, debugger, etc.. Best regards, -Shawn.