From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Mundt Subject: Re: Status of bzip2 and lzma kernel compression for ARM? Date: Fri, 26 Jun 2009 02:08:07 +0900 Message-ID: <20090625170806.GA22326@linux-sh.org> References: <4A428AFF.20307@free-electrons.com> <4A433BCD.2030506@compulab.co.il> <200906251104.02830.florian@openwrt.org> <4A4396CB.9000703@free-electrons.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <4A4396CB.9000703@free-electrons.com> Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michael Opdenacker Cc: Florian Fainelli , Mike Rapoport , Alain Knaff , Thomas Petazzoni , Russell King - ARM Linux , Linux Kernel Mailing List , linux-arm-kernel@lists.arm.linux.org.uk, linux-embedded mailing list On Thu, Jun 25, 2009 at 05:24:59PM +0200, Michael Opdenacker wrote: > On 06/25/2009 11:04 AM, Florian Fainelli wrote: > > Le Thursday 25 June 2009 10:56:45 Mike Rapoport, vous avez ?crit : > >> I'm not sure what exactly do you mean by "test bzip2 and lzma compression > >> on ARM", but if you refer to internal initramfs compression, I can tell > >> that I've used lzma compression on PXA270 and it works fine. > >> > > > > I think Michael refers to the lzma decompressor which allows you to use a > > lzma-compressed kernel as a (b)zImage with its architecture specific > > decompressor piggy-backed in the (b)zImage. > > > > Such thing would also be very useful on MIPS and PowerPC as well. > > > Yes, that's what I meant: using a bzip2 or lzma compressed kernel. I > would like to know the boot time impact on an ARM board. > > If I don't get any answer from Alain in the next days, I will propose a > patch update for ARM. > It's possible to use this generically now, yes. Anything building uImages today can basically wire it up in a similar fashion to how blackfin has and support it out of the box.