Hi Wolfgang, thanks for your reply. That's the kind of thing I wanted to hear. Now I will start playing around ;-)
Matthias On Tuesday 22 April 2008 22:49, Wolfgang Denk wrote: > In message <[EMAIL PROTECTED]> you wrote: > > > > Now I have to find a (simple) solution to solve my problem: > > > > Typically the 405 board boots from onboard flash. Because of historic > > reason there is a kernel and a ramdisk image (not a multi image and nothing > > that is aware of any new image format). These images cannot be changed. > > When one of these images either one of them or both is corrupted, U-Boot > > should try to load both of them from a usb mass storage. So what's the best > > way to do so? > > The key question here is your definition of "corrupted". > > If reliability is an issue, you want to implement (1) support for a > hardware watchdog combined with (2) support for a boot counter. Then > you set "bootlimit" to a reasonable value and "altbootcmd" to the > command required to load and boot from USB. > > Such a setup will be very robust and handle even situations when the > images look good (checksums are OK etc.) but fail to work (for > example, because of buggy binaries or libraries were included, config > files got corrupted, etc.). > > > 1) Make bootm fail when any image has a CRC error? > > This is trivial to do. Remember that you can always use "imi" to check > images; something like > > => imi $kernel_addr && imi $ramdisk_addr && bootm $kernel_addr $ramdisk_addr > > would do what you want. > > The new image format allows for even fancier methods. > > Or implement a boot counter and let the board reset on corrupt images > and then use "altbootcmd". > > > 2) Add a new command to check images and decide on the result > > Not needed. "iminfo" already does that. > > > Any idea? I think the idea behind this is clear. When images A are not ok > > boot > > images B. > > As mentioned above, the trick question is how you define when an > image is OK. > > > > Best regards, > > Wolfgang Denk > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
