From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932186AbbCLNGq (ORCPT ); Thu, 12 Mar 2015 09:06:46 -0400 Received: from pandora.arm.linux.org.uk ([78.32.30.218]:40310 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932076AbbCLNGl (ORCPT ); Thu, 12 Mar 2015 09:06:41 -0400 Date: Thu, 12 Mar 2015 13:06:35 +0000 From: Russell King - ARM Linux To: Stas Sergeev Cc: Gregory CLEMENT , Linux kernel , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] n_tty: use kmalloc() instead of vmalloc() to avoid crash on armada-xp Message-ID: <20150312130635.GP8656@n2100.arm.linux.org.uk> References: <54FF21BE.2040506@list.ru> <550038C9.7010807@free-electrons.com> <20150311131433.GC8656@n2100.arm.linux.org.uk> <550058BE.3060406@list.ru> <55005B81.9020103@free-electrons.com> <55005DC2.1060300@list.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <55005DC2.1060300@list.ru> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 11, 2015 at 06:22:42PM +0300, Stas Sergeev wrote: > 11.03.2015 18:13, Gregory CLEMENT пишет: > > On 11/03/2015 16:01, Stas Sergeev wrote: > >> 11.03.2015 16:14, Russell King - ARM Linux пишет: > >>> On Wed, Mar 11, 2015 at 01:44:57PM +0100, Gregory CLEMENT wrote: > >>>> Hi Stas, > >>>> > >>>> On 10/03/2015 17:54, Stas Sergeev wrote: > >>>>> Hello, the patch below is needed for a successful boot on armada-xp. > >>>>> > >>>> I am really surprised by this patch because I used the Armada XP based > >>>> board in a daily base and I never saw this issue. > >>> Can you provide some details about your board - does it have 8GB of > >>> memory, ranging from 0-0xf0000000, and 4G-8G ? > >> I wonder about this 256Mb memory hole. > > This is where the SoC registers are. > OK but it seems I am loosing this region of _physical_ memory: Correct, because the kernel can't see that physical memory. If it tries to access the physical memory at those locations, it hits the SoC registers and PCI instead of memory. -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net.