Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757559Ab3EGPws (ORCPT ); Tue, 7 May 2013 11:52:48 -0400 Received: from wolverine02.qualcomm.com ([199.106.114.251]:16978 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754771Ab3EGPwr (ORCPT ); Tue, 7 May 2013 11:52:47 -0400 X-IronPort-AV: E=Sophos;i="4.87,629,1363158000"; d="scan'208";a="45030447" Message-ID: <5189234D.3040208@codeaurora.org> Date: Tue, 07 May 2013 11:52:45 -0400 From: Christopher Covington User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0 MIME-Version: 1.0 To: Peter Maydell CC: Rusty Russell , "linaro-kernel@lists.linaro.org" , "patches@linaro.org" , "linux-kernel@vger.kernel.org List" , Alexander Graf , Amit Shah , "kvmarm@lists.cs.columbia.edu" , "linux-arm-kernel@lists.infradead.org" , Pranavkumar Sawargaonkar Subject: Re: [PATCH 0/2] Early printk support for virtio console devices. References: <1366974299-17877-1-git-send-email-pranavkumar@linaro.org> <87obcyc9sh.fsf@rustcorp.com.au> <336C59AA-D5D7-472E-A8DA-EEB413DD6C68@suse.de> <87sj27xxjr.fsf@rustcorp.com.au> <87ip2wr8tp.fsf@rustcorp.com.au> <87txmfo0rl.fsf@rustcorp.com.au> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1179 Lines: 30 On 05/07/2013 08:19 AM, Peter Maydell wrote: > On 7 May 2013 05:46, Rusty Russell wrote: >> Peter Maydell writes: >>> That all looks like sensible QEMU implementation possibilities >>> but it seems to be a bit of a non-sequitur from "how do we >>> tell the kernel to actually use this?" >> >> You enable the feature in the virtio console device, and a kernel >> compiled with EARLY_PRINTK will use it? > > Well, at the moment EARLY_PRINTK is hardcoded to > "use some specific UART or equivalent selected at > compile time". So the equivalent presumably would > be to hard-compile "use virtio-console", but then > how does that code know where the virtio-console > is in the address space? arm64 uses a kernel argument. Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/