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 -----Ursprüngliche Nachricht----- Von: Wolfgang Denk [mailto:w...@denx.de] Gesendet: Freitag, 4. September 2009 14:17 An: A. Geisreiter Cc: u-boot@lists.denx.de; Jean-Christophe Plagniol-Villard Betreff: Re: [U-Boot] Starting compressed win CE kernel Dear "A. Geisreiter", In message <001701ca2d55$f30b6200$d92226...@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: w...@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 mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
