[U-Boot] Starting compressed win CE kernel

[U-Boot] Starting compressed win CE kernel

[A. Geisreiter]

Hello,

 

I use U-Boot for starting Windows CE. At the moment I take the nk.bin File
and start it with the U-Boot patch of Ryan Chen. Now I will compress the
nk.bin file, because in addition to that it takes much less space in the
Flash memory. I have tried it with the unzip command, but it takes too much
time. Can I use another compression tool from u-boot. I think a compressed
linux kernel can be started with bootm. So can I use maybe only the
compression tool of the bootm command? If so, how can I do this?

 

Thanks,

Andreas

[U-Boot] Starting compressed win CE kernel

[Wolfgang Denk]

Dear "A. Geisreiter",

In message <000e01ca2d48$728b0890$57a119b0$@de> you wrote:
> Dies ist eine mehrteilige Nachricht im MIME-Format.

Please stop doing this. Please post plain text only. Do not post HTML.

> I use U-Boot for starting Windows CE. At the moment I take the nk.bin File
> and start it with the U-Boot patch of Ryan Chen. Now I will compress the
> nk.bin file, because in addition to that it takes much less space in the
> Flash memory. I have tried it with the unzip command, but it takes too much
> time. Can I use another compression tool from u-boot. I think a compressed
> linux kernel can be started with bootm. So can I use maybe only the
> compression tool of the bootm command? If so, how can I do this?

What makes you think that the uncompression code used by bootm would
be any faster than the one used by unzip? It ain't faster, as it is
the very same code actually.


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
ATTENTION: Despite Any Other Listing of Product Contents Found  Here-
on, the Consumer is Advised That, in Actuality, This Product Consists
Of 99.9999999999% Empty Space.

[U-Boot] Starting compressed win CE kernel

[A. Geisreiter]

Hello Mr. Denk,

> Please stop doing this. Please post plain text only. Do not post HTML.

Sorry, I don't know it.

> What makes you think that the uncompression code used by bootm would
> be any faster than the one used by unzip? It ain't faster, as it is
> the very same code actually.

If bootm use the same code like the unzip command, then it couldn't be
faster.
But I have compressed a nk.bin Windows Image file with GZIP. Then I
uncompressed the 10MB File with U-Boot. It takes roughly 1 minute. And this
is to much I think. What could I do to reduce the uncompression time? My
hardware works with an PXA270 CPU.

Thanks,
Andreas

[U-Boot] Starting compressed win CE kernel

[Wolfgang Denk]

Dear "A. Geisreiter",

In message <001701ca2d55$f30b6200$d9222600$@de> you wrote:
> 
> > What makes you think that the uncompression code used by bootm would
> > be any faster than the one used by unzip? It ain't faster, as it is
> > the very same code actually.
> 
> If bootm use the same code like the unzip command, then it couldn't be
> faster.

Indeed.

> But I have compressed a nk.bin Windows Image file with GZIP. Then I
> uncompressed the 10MB File with U-Boot. It takes roughly 1 minute. And this
> is to much I think. What could I do to reduce the uncompression time? My
> hardware works with an PXA270 CPU.

You probably want to enable caches on your system, to get faster
performance. Jean-Christophe (on Cc:) claimed several times before
that he was working on such patches. Maybe you ask him when he will
post this stuff.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
On the subject of C program indentation: "In My Egotistical  Opinion,
most  people's  C  programs  should be indented six feet downward and
covered with dirt."                               - Blair P. Houghton

[U-Boot] Starting compressed win CE kernel

[Dirk Behme]

Wolfgang Denk wrote:
> Dear "A. Geisreiter",
> 
> In message <001701ca2d55$f30b6200$d9222600$@de> you wrote:
>>> What makes you think that the uncompression code used by bootm would
>>> be any faster than the one used by unzip? It ain't faster, as it is
>>> the very same code actually.
>> If bootm use the same code like the unzip command, then it couldn't be
>> faster.
> 
> Indeed.
> 
>> But I have compressed a nk.bin Windows Image file with GZIP. Then I
>> uncompressed the 10MB File with U-Boot. It takes roughly 1 minute. And this
>> is to much I think. What could I do to reduce the uncompression time? My
>> hardware works with an PXA270 CPU.
> 
> You probably want to enable caches on your system, to get faster
> performance. Jean-Christophe (on Cc:) claimed several times before
> that he was working on such patches. Maybe you ask him when he will
> post this stuff.

Unfortunately, there was no answer to

http://lists.denx.de/pipermail/u-boot/2009-August/058700.html

Dirk

[U-Boot] Starting compressed win CE kernel

[A. Geisreiter]

Dear Jean-Christophe PLAGNIOL-VILLARD,

I tried to use the unzip command of U-Boot, to unzip a Win CE Kernel. If I
have a file size of roughly 10MB it takes 1 minute to uncompress the kernel.
This is too long for my application. I use an PXA270 CPU with 64MB SDRAM.
How can I make the unzip command faster? 
Description of my U-Boot application: At the moment I start Win CE from the
flash memory in roughly 25 seconds. But the image takes much space on the
flash, because I haven't compressed it at the moment. So I will use the zip
functionality of U-boot to save space on flash memory. But this is only
reasonable, if I can start the OS in roughly the same time as before. 

Thanks and regards,
Andreas Geisreiter

-----Urspr?ngliche Nachricht-----
Von: Wolfgang Denk [mailto:wd at denx.de] 
Gesendet: Freitag, 4. September 2009 14:17
An: A. Geisreiter
Cc: u-boot at lists.denx.de; Jean-Christophe Plagniol-Villard
Betreff: Re: [U-Boot] Starting compressed win CE kernel

Dear "A. Geisreiter",

In message <001701ca2d55$f30b6200$d9222600$@de> you wrote:
> 
> > What makes you think that the uncompression code used by bootm would
> > be any faster than the one used by unzip? It ain't faster, as it is
> > the very same code actually.
> 
> If bootm use the same code like the unzip command, then it couldn't be
> faster.

Indeed.

> But I have compressed a nk.bin Windows Image file with GZIP. Then I
> uncompressed the 10MB File with U-Boot. It takes roughly 1 minute. And
this
> is to much I think. What could I do to reduce the uncompression time? My
> hardware works with an PXA270 CPU.

You probably want to enable caches on your system, to get faster
performance. Jean-Christophe (on Cc:) claimed several times before
that he was working on such patches. Maybe you ask him when he will
post this stuff.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
On the subject of C program indentation: "In My Egotistical  Opinion,
most  people's  C  programs  should be indented six feet downward and
covered with dirt."                               - Blair P. Houghton