Dear Thomas Heller, In message <i3egu9$t2...@dough.gmane.org> you wrote: > > 'make uImage' in the linux kernel tree builds a linux kernel image > that u-boot can use. How can I change the compression that is used?
You can change these by changing the Make rules and/or providing appropriate options. > Actually, I'm not even sure whether my kernel is compressed or not. > Here is the laat part of the output from 'make uImage'; it tells me > the kernel is not compressed: This not quite correct. It tells you that the payload it sees is not compressed. > however the embedded system tells me it is uncompressing: > > > => bootm 0x80108000 > > ## Booting kernel from Legacy Image at 80108000 ... > > Image Name: Linux-2.6.31 > > Image Type: ARM Linux Kernel Image (uncompressed) That means: U-Boot does not know about any comprtession, so it does not uncompress the payload. > > Starting kernel ... Here the kernel image started running... > > Uncompressing > > Linux.................................................................................................... > > done, booting the kernel. And this is doing the uncompressions. This is a typical (wasteful) ARM image. On ARM, the kerne image gets compressed - but instead of simply wrapping this into an uImage file, they add their own uncompress code to it, which wraps the kernel image, so what U-Boot sees is actually hte (uncompressed) wrapper code which then does the copying / uncompressing. If you say it makes littel sense to wste space for the images and time for the loading for additional header code and uncompression routines that are already ready avaialable in U-Boot I fully agree - but the ARM kernel folks think different. 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 (null cookie; hope that's ok) _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
