On Mon, 17 Jan 2005 07:22:03 -0800 (PST), Alireza Sadri arsadri@yahoo.ca wrote:
I need to load my new uboot image from SDRAM , not from Flash. Is that possible and how can i do that?
Yes this is possible, however in most cases not a good idea (See the links to the FAQs already posted.)
I've done this with our platform as we only have 4KB able to be booted from (much much too small for U-Boot.) So we have a primary bootloader that comes up on boot, does all board and processor initialization (including TLB's and SDRAM) required for the platform and then loads a modified version of U-Boot into SDRAM.
In this case, U-Boot is only used as a ROM Loader and does not handle many of the tasks that it would normally handle to normally bring-up the board. Additionally, in this case, the U-Boot Loader running from SDRAM CANNOT be used as the only boot agent and will require another boot agent to load it.
Regards,