From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C73AC433FF for ; Wed, 31 Jul 2019 17:50:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1D5452067D for ; Wed, 31 Jul 2019 17:50:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="xVZBrUEN"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="IP2j/5Od" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726696AbfGaRuE (ORCPT ); Wed, 31 Jul 2019 13:50:04 -0400 Received: from bedivere.hansenpartnership.com ([66.63.167.143]:59846 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726377AbfGaRuE (ORCPT ); Wed, 31 Jul 2019 13:50:04 -0400 Received: from localhost (localhost [127.0.0.1]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 4F2CB8EE12F; Wed, 31 Jul 2019 10:50:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hansenpartnership.com; s=20151216; t=1564595404; bh=VDmbtsliub913Jm/oRGCvY0XXIepPO7LXMuEm+2jgHI=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=xVZBrUEN6SQh+7wb6yE0GfrQOyWc82N1c2FstkGtjuoH4pyWpxZ1SXk9+Ut9g9v0y IM+MfF8sb0+V6jyJT9/Ucf4Tpwy3p6bMm7p2oAbhAY9LsNdqH4EOUiI+awqp9/x/SY ahtJ5Gg7DKtm5D/gC1jBtV1znxJ0ycTetMUkzsqs= Received: from bedivere.hansenpartnership.com ([127.0.0.1]) by localhost (bedivere.hansenpartnership.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UnCVMSNUxjlU; Wed, 31 Jul 2019 10:50:04 -0700 (PDT) Received: from jarvis.lan (unknown [50.35.71.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by bedivere.hansenpartnership.com (Postfix) with ESMTPSA id CABC88EE10C; Wed, 31 Jul 2019 10:50:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=hansenpartnership.com; s=20151216; t=1564595403; bh=VDmbtsliub913Jm/oRGCvY0XXIepPO7LXMuEm+2jgHI=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=IP2j/5OdXarS9ZDdlBv5DUscNnRBDKayxoXbrxOAHqLlvTUhtfUX7oohkNwzlYcc0 rdcVyS5aAy2Bfk+5HnwWX7UDT5JrNSSlBSav8Bkb2d3m3V4MmxLerliJQhEJlZvyk/ KwjTRGojZvgp4xDLq4huix/ENxVYhUr6zZOIyqBA= Message-ID: <1564595402.3319.40.camel@HansenPartnership.com> Subject: Re: Compressed kernels currently won't boot From: James Bottomley To: Sven Schnelle Cc: Parisc List Date: Wed, 31 Jul 2019 10:50:02 -0700 In-Reply-To: <20190731173016.GA23520@t470p.stackframe.org> References: <1564591443.3319.30.camel@HansenPartnership.com> <20190731173016.GA23520@t470p.stackframe.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Wed, 2019-07-31 at 19:30 +0200, Sven Schnelle wrote: > Hi, > > On Wed, Jul 31, 2019 at 09:44:03AM -0700, James Bottomley wrote: > > I noticed this trying to test out compressed kernel booting. The > > problem is that a compressed kernel is divided into two pieces, one > > of which starts at 0x000e0000 and is the bootstrap code which is > > uncompressed into 0x00100000 and the rest of which is the real > > compressed kernel which is loaded above the end of the current > > decompressed size of the entire kernel. palo decompresses the head > > and jumps to it and it then decompresses the rest of the kernel > > into place. This means that the first part of the compressed image > > can't be larger than 0x20000 == 131072 because otherwise it will be > > loaded into an area that decompression will alter. > > > > The problem is that a change was introduced by > > > > commit 34c201ae49fe9e0bf3b389da5869d810f201c740 > > Author: Helge Deller > > Date: Mon Oct 15 22:14:01 2018 +0200 > > Hmm. This is what i've been facing as well. Yes, except you're a more extreme case than me ... you actually have the compressed segment overlapping the end of the decompressed text. that does seem to mean we have a lot of no-load debug information which isn't useful to the compressed image. > After reading this commit i'm not sure that the patch i've just sent > ("parisc: strip debug information when building compressed images") > is really wanted. However, it is really a pain to always copy huge > lifimages around when booting parisc machines via LAN. Does someone > really extract the vmlinux file from a compressed kernel images? > Should we keep that? Well, it's a thing. There's a script in the kernel source tree scripts/extract-vmlinux that does it. It doesn't seem to be packaged by debian, though. James