linux-kernel - Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

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Date:	Fri, 07 Aug 2009 11:36:56 +0200
From:	Alain Knaff <alain@...ff.lu>
To:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	sam@...nborg.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	linux-embedded@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

On 08/07/09 11:24, Albin Tonnerre wrote:
> On Thu, Aug 06, 2009 at 11:40:55PM +0100, Russell King - ARM Linux wrote :
>> On Mon, Aug 03, 2009 at 04:58:19PM +0200, Albin Tonnerre wrote:
>>> This is the second part of patch. This part includes:
>>>  - changes to ach/arch/boot/Makefile to make it easier to add new
>>>    compression types
>>>  - new piggy.lzo.S necessary for lzo compression
>>>  - changes in arch/arm/boot/compressed/misc.c to allow the use of lzo or
>>>    gzip, depending on the config
>>>  - Kconfig support
> 
>> FYI, with these patches applied and selecting GZIP method, I get
>> linker errors.  I've been unable to track down what's going on, but
>> it appears to be a libgcc issue.
> 
>> In spite of the decompressor being built as an EABI object, gcc seems
>> to be issuing calls to __umodsi3, which isn't in the EABI libgcc
>> (they're called something different - don't ask.)
> 
> I also happen to have issues related to the linker not finding __aeabi_uidivmod,
> but only when compiling with CONFIG_CC_OPTIMIZE_FOR_SIZE. Is it similar for you,
> or does it also fail when compiling with -O2 ?
> 
>> So I think these patches need further testing and evaluation on ARM
>> before they can be merged.  Moreover, I'd like to see some comparisons
>> between the _current_ gzip method, the new gzip method and the lzo
>> method on ARM.
> 
> I don't have my ARM platforms at hand, but I'll so these comparisons in a couple
> days when I access to them again.
> 
> Regards,

Could it be that the patches that remove division (zutil.h and inflate.c)
have somehow not been applied?

Regards,

Alain
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