Dear Juergen, On Fri, Feb 26, 2010 at 12:16:22PM +0100, Juergen Schindele wrote: > Am Freitag, 26. Februar 2010 schrieb Wolfgang Denk: > > Dear Juergen Schindele, > > > > In message <201002261056.32502.schind...@nentec.de> you wrote: > > > > > > i need a different bootloader than the one installed. > > > so i tried to develop a private one by loading it to RAM. > > > So i modified the TEXT_BASE = 0x00400000 > > > to not collide with the installed one. > > > > This is not enough. You must also make sure not to try to perform all > > the low level initializations again that have already been done. > I know that, but SKIP_LOW_LEVEL_INIT is defined because > register init is done with kirkwood boot header for booting from > SPI/NAND-Flash. I dont see other blocking points. :-( > i tried to skip relocate too but it did not help !
I have absolutely no experience concerning kirkwood, but did the same for coldfire for running U-Boot as the flasher application started from the debugger... IIRC there were three places I had to change for coldfire: - low-level init: do not put the vector table at the beginning of code (probably better: initialize it in the proper place?) - leave the vector base register as it is (should be set up properly by first loader/debugger, and U-Boot does not use interrupts) - the cpu speed detection/setting code was basically switched back to detection for CONFIG_MONITOR_IS_IN_RAM because it involved putting the RAM to self-refresh, which is obviously not possible when running from it (For Coldfire, a special case was that I had to disable monitor protection manually because the standard condition fails due to the memory layout.) Here's my patch for Coldfire MCF532x/7x: http://www.mail-archive.com/u-boot@lists.denx.de/msg28779.html BTW, disabling relocation may lead to bad results for malloc and the initial stack setup. I am not sure but seem to remember I had some problems when I tried it - and, it should not be a problem to do it as usual anyways if everything else is working correctly. Hope this can give some useful hints, Wolfgang _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot