Hi Wolfgang, Le 27/02/2011 19:11, Wolfgang Denk a écrit :
nand_spl loads the U-Boot code into RAM, and then relocates it (which includes copying it to the final location). There is no relocation done twice, only the copying, and this cannot be avoided as the bootstrap loader cannot determine the final position of the image yet. If you are sure that you have a static system with a fixed memory map you can configure nand_spl such that it copies U-Boot to the final location, one copy operation can be saved (you still need the relocation, though).
Note that in the case of ARM -- don't know about other archs -- if the final U-Boot location is known in advance, then one could try linking U-boot to that final location, in which case the relocation would not be needed either and should normally be skipped by the code currently in start.S.
Amicalement,