[U-Boot] Support required for loading U-boot on SDRAM

[Sadashiva Reddy]

Hi Sir,

I am using AMCC PPC440Gx processor for our project presently the board is working fine with vxWorks(BSP + OS + Application). 
But our customer new requirement is same board should be ported with linux.


1. We are using BDI2000 JTAG tool for porting u-boot and kernel.

2. We are not able to load the u-boot or u-boot.bin file directly to SDRAM location.

3. When we try to load its load to the flash loaction i.e what ever we mention in the macro  
    CONFIG_SYS_TEXT_BASE from board.h file its loads to that location and when we 
    give go command it throws an error called JTAG instruction overrun.

4. When we build the u-boot code the file size of u-boot.bin is always created with the macro 
    initialized by CONFIG_SYS_TEXT_BASE from the board.h file.

5. We are able to load u-boot.bin to a flash location directly but u-boot is not coming up.
    So to debug the u-boot we are trying to load directly to SDRAM location. VxWorks is 
    coming up when we load directly to SDRAM location. 
    
6. I think the u-boot is creating a u-boot.bin file to load for flash loaction. How to create an 
    image or bin file to load on SDRAM location directly.


Best Regards,
Sadashiv