linux-kernel - Re: Status of bzip2 and lzma kernel compression for ARM?

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Date:	Fri, 26 Jun 2009 02:08:07 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Michael Opdenacker <michael-lists@...e-electrons.com>
Cc:	Florian Fainelli <florian@...nwrt.org>,
	Mike Rapoport <mike@...pulab.co.il>,
	Alain Knaff <alain@...ff.lu>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-embedded mailing list <linux-embedded@...r.kernel.org>
Subject: Re: Status of bzip2 and lzma kernel compression for ARM?

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.
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