Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757958Ab3DSJe6 (ORCPT ); Fri, 19 Apr 2013 05:34:58 -0400 Received: from mail-pa0-f54.google.com ([209.85.220.54]:37559 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756572Ab3DSJe4 (ORCPT ); Fri, 19 Apr 2013 05:34:56 -0400 MIME-Version: 1.0 In-Reply-To: References: <1366264344-28025-1-git-send-email-pranavkumar@linaro.org> <20130419090558.GA13283@mudshark.cambridge.arm.com> <20130419092752.GB13283@mudshark.cambridge.arm.com> Date: Fri, 19 Apr 2013 15:04:56 +0530 Message-ID: Subject: Re: [RFC] arm64: Early printk support for virtio-mmio console devices. From: Pranavkumar Sawargaonkar To: Peter Maydell Cc: Will Deacon , "linaro-kernel@lists.linaro.org" , Patch Tracking , Marc Zyngier , "linux-kernel@vger.kernel.org" , "kvmarm@lists.cs.columbia.edu" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1153 Lines: 29 On 19 April 2013 15:00, Peter Maydell wrote: > On 19 April 2013 10:27, Will Deacon wrote: >> On Fri, Apr 19, 2013 at 10:25:35AM +0100, Pranavkumar Sawargaonkar wrote: >>> I am not against using 8250 emulation (as far as it solves printk >>> issues for kernel booting logs), but my point is why not to add early >>> read-write support for virtio console, which also can be useful in >>> emulation less mach-virt environment also ? >> >> We can have both, but only one of those requires a change to the virtio >> specification. > > I don't think avoiding writing a spec is necessarily a good reason > for insisting on emulation of a lump of hardware 95% of whose > capabilities you aren't going to use... True. Also 8250 will require emulation of registers, and i am not sure about if mach-virt will have any emulation of real hw ? Thanks, Pranav > > -- PMM -- 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/