From mboxrd@z Thu Jan 1 00:00:00 1970 From: Helge Deller Subject: HP J5600/J6750 64bit SMP CPU#1 stuck problems [was: Does there exists any 32bit-only PARISC SMP machines?] Date: Mon, 21 Oct 2013 22:07:37 +0200 Message-ID: <52658989.5090508@gmx.de> References: <521F9848.4010404@gmx.de> <1377830541.2331.5.camel@dabdike> <20130903155643.GA1430@glitch> <20130904140705.GA30223@glitch> <20130904142847.GA2893@glitch> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: Dave Land , John David Anglin To: linux-parisc , Domenico Andreoli Return-path: In-Reply-To: <20130904142847.GA2893@glitch> List-ID: List-Id: linux-parisc.vger.kernel.org Domenico, On 09/04/2013 04:28 PM, Domenico Andreoli wrote: >>>> J5600 is SMP capable in both 32bit and 64bit mode. >>>> mine doesn't boot 64bit SMP since 2.6.22. I've never been able to trace >>>> it down but can confirm it happens also on more recent kernels. >> >> I confirm that smp parisc64 v3.11 doesn't bring up both the cpus on my >> system but at least it boots one, something that didn't happen in some >> darker moments since 2.6.22. >> >> similar "SMP: CPU:1 is stuck." happens also with debian v3.10-parisc64-smp kernel. > > BTW, this is the most detailed investigation I'm aware of: > https://lkml.org/lkml/2008/4/20/251 Dave Anglin had the idea that the 64bit SMP CPU#1 stuck problems might be related to PDC- or I/O-space conflicts with physical memory. On Dave Land's machine (J6750) we could verify that off-list. I assume you have more than 3GB (4GB) RAM in your machine? If yes, then if you phyiscally remove some memory so that you leave a max. of 3GB in, the 64bit SMP kernel will most likely boot up all CPUs. You wrote: > mine doesn't boot 64bit SMP since 2.6.22. Are you *really* sure that it booted 64bit SMP with kernel 2.6.22 ? Or did you maybe upgraded memory after that date? If it sucessfully booted, then we maybe have only some kind of regression. Helge