From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from grelber.thyrsus.com (static-71-162-243-5.phlapa.fios.verizon.net [71.162.243.5]) by ozlabs.org (Postfix) with ESMTP id B67D5B7BA4 for ; Thu, 22 Oct 2009 09:54:53 +1100 (EST) From: Rob Landley To: linuxppc-dev@lists.ozlabs.org Subject: Serial console under current qemu: bisected. Date: Wed, 21 Oct 2009 17:54:48 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Message-Id: <200910211754.49223.rob@landley.net> Cc: alan@redhat.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Last week I reported a bug: http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-October/076727.html I managed to drill past the unrelated breakage and bisect it back to the relevant commit: It was introduced leading up to 2.6.29, by commit f751928e0ddf54ea4fe5546f35e99efc5b5d9938 written by Alan Cox. It seems to make the kernel panic as soon as IRQs are enabled in the presence of CONFIG_SERIAL_PMACZILOG=y. It's trivially reproducible under current qemu- git. Kernels before that boot to a shell prompt, kernels after that panic as soon as init launches. (They work fine when you're not using a serial console.) Rob -- Latency is more important than throughput. It's that simple. - Linus Torvalds