On Monday 09 June 2008, Frank Wei wrote: > I'm new to u-boot. Has anybody tried to make 2-step u-boot? I mean a really > small u-boot (the first u-boot) possible only needs to initialize the CPU, > memory... and load the full featured (the second u-boot) u-boot and the > Linux to the RAM. In this way the second u-boot as an application can be > updated on the fly. > > Could you please share your knowledge here If you have done the job or the > similar?
Yes, there already is a framework for a 2-stage U-Boot booting in place. Take a look at the nand_spl (NAND Secondary Program Loader) infrastructure: nand_spl/* doc/README.nand-boot-ppc440 Here a small (4k) image is build which only inits the basic CPU stuff, RAM and NAND controller. Then a full-blown U-Boot image is loaded from NAND. Best regards, Stefan ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: [EMAIL PROTECTED] ===================================================================== ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
