Dear Marcel, In message <[email protected]> you wrote: > > I do however have some questions about the u-boot startup behaviour.
Please read the manual; it should cover most of your questions. > What I want to create is the following : > > 1) u-boot starts and checks if it can start my application (either CRC check > or whatever). This is the first thing u-boot should do. > 2) if it can't boot it will listen on USB or ethernet for someone to upload a > valid image or boot via NFS or whatever has been configured. This is standard behaviour. See 7.4. Boot Arguments Unleashed etc., http://www.denx.de/wiki/view/DULG/LinuxBootArgs > 3) If it can boot, it will boot immediately (there may be a GPIO pin to > override this behaviour) setenv bootdelay 0 > 4) once within the application (linux or whatever) I must be able to set a > flag > that lets u-boot wait for uploading a new image file when I soft-reset my > device. This is needed for firmware upgrading of course. I still need to > check > if this flag is supported by the CPU or needs other support (eeprom perhaps). see tools/env for tools to read and write the U-Boot environment settings from Linux. This can be used to change the boot command, boot delay etc. > 5) After uploading an image the soft-reset is cleared and the whole sequence > start over again, so it should boot the new image. You can script all these things in U-Boot. > I know it's possible to do this but I wonder if it has been done before and > if > there any examples of it ? There is all kinds of more or less complext stuff around. Read the manual. Read the default configurations set in other board config files. Read the code available in board/*/auto_update.c etc. 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: [email protected] The first 90% of a project takes 90% of the time, the last 10% takes the other 90% of the time. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
