[U-Boot-Users] LZMA support (patch)

[Luigi 'Comio' Mantellini]

Hi Jerry,

see inline comments.

On ven, 2008-03-28 at 13:31 -0400, Jerry Van Baren wrote:
> Luigi 'Comio' Mantellini wrote:
> > Hi everyone,
> > 
> > this patch adds the lzma support with the following constraints:
> > 
> >  - it doesn't install the LZMA SDK files. I provide the import_lzma.sh
> > script to import the needs file from a lzma sdk release
> >  - the imported lzma sdk files are _not touched_
> >  - the lzma support is enabled defining the CONFIG_LZMA define
> >  - I haven't tested this patch
> >  - Use this patch at your own risk
> > 
> > The patch creates:
> > 
> >  - the lib_lzma directory with the import_lzmasdk.sh script and a simple
> > front-end to LzmaDecode() fuction
> >  - the include/lzma directory with some include files to use in the
> > U-Boot code
> > 
> > modifies:
> > 
> >  - common/do_bootm.c file
> >  - common/image.c file
> >  - include/image.h file
> > 
> > Please read the lib_lzma/README.txt file.
> > 
> > Luigi
> 
> Hi Luigi,
> 
> I have a stupid question in return: why do we want lzma (7zip) added to 
> u-boot?  The linux/uboot world is dominated by gzip.  I realize 7zip has 
> advantages over gzip albeit incremental, not revolutionary IIRC.
> 

LZMA usually performs better than gzip in terms compression ratio. My
application has a small flash memory and I need to keep two (2) kernel
images... 

>From these observations born my need to save as much memory as possible.


Best regards,

luigi

> I am not aware of proposals or implementations of kernels compressed 
> with lzma (could well be my ignorance).  Adding more code for minimal 
> benefits is a hard sell (we already have plenty of bloat :-O).
> 
> Best regards,
> gvb

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