On 10/27/2010 01:40 PM, Wolfgang Denk wrote:
Dear Darius Augulis,
In messageAANLkTimWZv=XBC1s1G8-=D6nAJ09poqHYP9RXHeTTM4q@mail.gmail.com you wrote:
I don't think we can define CONFIG_SKIP_RELOCATE_UBOOT with relocation enabled unless we ensure that the TEXT_BASE would be same as the relocation address.
in case of nand_spl you don't need to to relocation twice because it's done by preloader.
Maybe, maybe not. The preloader is usually very simple and may not be clever enough to adjust the oad address to the avalable memory and such; also, U-Boot features like protected RAM, shared video buffers or log buffers may also require to dynamically adjust the final load address. In such cases relocation will be needed.
I confess I didn't understant you - why relocation could be needed in case of nand or other preloader? I have been thinking that main and single task of preloader is to copy uboot image from flash memory to main memory (SDRAM) where it's linked to (TEXT_BASE). Why one may need to relocate it twice (and where) ? IMO since uboot image is copied to TEXT_BASE it can run normaly, without fixing any address or relocating somewhere? It's enough to have dummy loader which initializes SDRAM and copies few pages from nand to SDRAM, isn't it? Why should it be more clever? Also I've been thinking that relocation is needed only when booting directly from NOR flash, to have possibility to erase and program flash memory. Could you please point me where I'm wrong?
Thanks, Darius
Best regards,
Wolfgang Denk