Hello Reinhard, Reinhard Meyer wrote: > Dear Heiko Schocher, > >>>>> In message<4ca4aeff.3050...@denx.de> you wrote: >>>>>> If TEXT_BASE == relocation address it could be defined, >>>>>> never tested. > > If I think right, relocation address would vary with u-boot size, > so there seems no really reliable way to ensure above "if" is true. > Even worse, when it happens to become untrue because the size > changed, it will try to relocate overlapping areas.
Yes, true, but you can with each release try your u-boot, and eventually fix it ... >>> Actually CONFIG_SKIP_RELICATE_UBOOT should become unneeded once all >>> boards which use it are made to support relocation, as the code will >>> always check if it runs at its intended location and relocate only if >>> needed. > > "intended location" == "relocation address based on ram size" ?? admitted, just a good idea for boards where ramsize is always fix ... >> If u-boot starts in RAM, then it is the task from the preloader >> where it copies u-boot code, and if there is somewhere in IRAM >> enough room for it, this would be an option. Otherwise it is a >> problem if relocation results in overlapping source and destination >> areas ... but you will fast detect this problem, when you see, >> that u-boot no longer works ;-) > > I think it would be safe that a preloader loads u-boot to the very > bottom of SDRAM. If the SDRAM is not at least double the size of > u-boot, u-boot needs a diet ;) Yep. Idea behind my "intended location == relocation address" is to save one copy of u-boot (one from the preloader and one from relocation) ... but this is not a need for all boards, this is something a board maintainer can decide and use (for example, if speed is a critical point) ... bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
