From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 12 Jul 2013 11:21:43 +1000 From: Michael Ellerman To: Chris Friesen Subject: Re: visible memory seems wrong in kexec crash dump kernel Message-ID: <20130712012142.GA24112@concordia> References: <51DF1BBB.5060904@mail.usask.ca> <51DF2229.5010604@mail.usask.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <51DF2229.5010604@mail.usask.ca> Cc: kexec@lists.infradead.org, Paul Mackerras , linuxppc-dev@lists.ozlabs.org, Vivek Goyal List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, Jul 11, 2013 at 03:22:49PM -0600, Chris Friesen wrote: > On 07/11/2013 02:55 PM, Chris Friesen wrote: > >Hi, > > > >I'm running 2.6.34 with kexec 2.0.1 on a Freescale p5020-based system > >with 8GB of memory. (It's an embedded system and I can't do much > >about the fact that it's using older software.) > > I should probably clarify this...I may be able to update kexec, I > can't update the kernel but I can backport more recent code if > necessary. > > Looking at the version of kexec that I have, it seems like where x86 > uses "memmap=" to specify the memory map usable by the capture > kernel, powerpc does something different. >>From memory, it's been years, on powerpc we add properties to the memory nodes in the device tree that specify which memory is usable. The properties are called "linux,usable-memory", and in modern kernels they are read in early_init_dt_scan_memory(). cheers